4.7 Review

Comparing COVID-19 vaccines for their characteristics, efficacy and effectiveness against SARS-CoV-2 and variants of concern: a narrative review

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Potential adverse effects of COVID19 vaccines among Iraqi population; a comparison between the three available vaccines in Iraq; a retrospective cross-sectional study

Hind B. Almufty et al.

Summary: This study aimed to investigate potential side effects of COVID-19 vaccines, associated risk factors, and compare three vaccines available in Iraq. Results showed that symptoms post-vaccination were mostly mild to moderate, with fatigue, injection site reactions, fever, myalgia, headache, and chills being the most reported. Factors like younger age, female gender, history of COVID-19, comorbidities, and receiving the AstraZeneca vaccine were associated with higher risk of adverse reactions.

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The Duration, Dynamics, and Determinants of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Antibody Responses in Individual Healthcare Workers

Sheila F. Lumley et al.

Summary: In this study, it was found that anti-nucleocapsid antibodies against SARS-CoV-2 decline within a few months, with higher titers associated with longer duration. On the other hand, anti-spike IgG remained stably detected. Factors such as age, ethnicity, and symptom presentation also had an impact on antibody levels.

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Article Medicine, General & Internal

Safety and efficacy of the ChAdOx1 nCoV-19 vaccine (AZD1222) against SARS-CoV-2: an interim analysis of four randomised controlled trials in Brazil, South Africa, and the UK

Merryn Voysey et al.

Summary: The ChAdOx1 nCoV-19 vaccine has been shown to have an acceptable safety profile and effectiveness against symptomatic COVID-19, with higher efficacy observed in the group that received a low dose followed by a standard dose.

LANCET (2021)

Article Biochemistry & Molecular Biology

Reduced neutralization of SARS-CoV-2 B.1.1.7 variant by convalescent and vaccine sera

Piyada Supasa et al.

Summary: Research on the UK-dominant variant B.1.1.7 shows that it is harder to neutralize than the parental virus, but widespread escape from antibodies or monoclonal antibodies has not been observed yet.
Article Biochemistry & Molecular Biology

Multiple SARS-CoV-2 variants escape neutralization by vaccine-induced humoral immunity

Wilfredo F. Garcia-Beltran et al.

Summary: New variants of SARS-CoV-2 show high resistance to vaccine neutralization, with some able to escape vaccine responses with just a few mutations, highlighting the importance of developing broadly protective measures against variants.
Article Medicine, General & Internal

Effectiveness of mRNA BNT162b2 COVID-19 vaccine up to 6 months in a large integrated health system in the USA: a retrospective cohort study

Sara Y. Tartof et al.

Summary: This study aimed to assess the overall and variant-specific effectiveness of the BNT162b2 vaccine against SARS-CoV-2 infections and COVID-19-related hospital admissions among members of a healthcare system in California. The effectiveness of the vaccine remained high against hospital admissions even up to 6 months after full vaccination, despite a decline in effectiveness against SARS-CoV-2 infections over time, which was likely due to waning immunity rather than the delta variant escaping vaccine protection.

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Article Medicine, General & Internal

Single-dose administration and the influence of the timing of the booster dose on immunogenicity and efficacy of ChAdOx1 nCoV-19 (AZD1222) vaccine: a pooled analysis of four randomised trials

Merryn Voysey et al.

Summary: The AZD1222 vaccine has been approved for emergency use in the UK with an interval of 4-12 weeks between doses. Analysis shows that the vaccine is efficacious with two doses and provides immunoprotection after the first dose before the second dose is administered.

LANCET (2021)

Article Medicine, General & Internal

Safety and efficacy of an rAd26 and rAd5 vector-based heterologous prime-boost COVID-19 vaccine: an interim analysis of a randomised controlled phase 3 trial in Russia

Denis Y. Logunov et al.

Summary: The Gam-COVID-Vac vaccine showed 91.6% efficacy against COVID-19 in the phase 3 trial, with good safety and tolerability in a large cohort of participants.

LANCET (2021)

Article Multidisciplinary Sciences

Sensitivity of SARS-CoV-2 B.1.1.7 to mRNA vaccine-elicited antibodies

Dami A. Collier et al.

Summary: The B.1.1.7 variant of SARS-CoV-2 exhibited reduced neutralization by vaccines and antibodies from recovered COVID-19 patients, with a more substantial loss seen when introducing the E484K mutation. This mutation poses a threat to the efficacy of the BNT162b2 vaccine.

NATURE (2021)

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Antibody resistance of SARS-CoV-2 variants B.1.351 and B.1.1.7

Pengfei Wang et al.

Summary: The COVID-19 pandemic has had global repercussions, with promising vaccines and monoclonal antibody therapies. However, newly detected variants of SARS-CoV-2 present challenges to these treatment options.

NATURE (2021)

Article Multidisciplinary Sciences

mRNA vaccine-elicited antibodies to SARS-CoV-2 and circulating variants

Zijun Wang et al.

Summary: Volunteers who received the Moderna or Pfizer-BioNTech vaccine showed high levels of antibodies and memory B cell responses against SARS-CoV-2, with activity similar to individuals who had recovered from natural infection. However, their efficacy against specific SARS-CoV-2 variants was reduced, indicating a potential need for periodic updates to mRNA vaccines to maintain clinical efficacy.

NATURE (2021)

Article Biochemistry & Molecular Biology

SARS-CoV-2 501Y.V2 escapes neutralization by South African COVID-19 donor plasma

Constantinos Kurt Wibmer et al.

Summary: The SARS-CoV-2 virus in the B.1.351 variant discovered in South Africa can evade neutralization by most antibodies when expressed, but does not affect binding by convalescent plasma. This suggests the potential for reinfection with antigenically distinct variants and predicts reduced efficacy of spike-based vaccines.

NATURE MEDICINE (2021)

Article Biochemistry & Molecular Biology

Neutralization of SARS-CoV-2 spike 69/70 deletion, E484K and N501Y variants by BNT162b2 vaccine-elicited sera

Xuping Xie et al.

Summary: The study found that human sera from recipients of the BNT162b2 vaccine can neutralize SARS-CoV-2 viruses containing key spike mutations from the newly emerged UK and SA variants.

NATURE MEDICINE (2021)

Article Medicine, General & Internal

BNT162b2 mRNA Covid-19 Vaccine in a Nationwide Mass Vaccination Setting

Noa Dagan et al.

Summary: A study conducted in Israel on nearly 600,000 individuals showed that the BNT162b2 mRNA vaccine was effective in reducing the risk of infection, hospitalization, and severe Covid-19. The effectiveness in preventing death was 72% during the period from day 14 through day 20 after the first dose, and hospitalization was reduced by 87% for the period 7 or more days after the second dose, similar to results from a randomized trial.

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Antibody Responses in Seropositive Persons after a Single Dose of SARS-CoV-2 mRNA Vaccine

Florian Krammer et al.

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Neutralizing Activity of BNT162b2-Elicited Serum

Yang Liu et al.

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Estimated transmissibility and impact of SARS-CoV-2 lineage B.1.1.7 in England

Nicholas G. Davies et al.

Summary: A new variant of SARS-CoV-2 has emerged in England, with a higher reproduction number and potential for large resurgences of COVID-19 cases. Without stringent control measures, it is projected that COVID-19 hospitalizations and deaths in England for the first 6 months of 2021 will exceed those in 2020. The variant has spread globally and exhibited similar transmission increases in Denmark, Switzerland, and the United States.

SCIENCE (2021)

Article Medicine, General & Internal

Risk of mortality in patients infected with SARS-CoV-2 variant of concern 202012/1: matched cohort study

Robert Challen et al.

Summary: The study found that the mortality hazard ratio associated with infection with VOC-202012/1 compared with previously circulating variants was 1.64, indicating an increase in deaths from 2.5 to 4.1 per 1000 detected cases in comparatively low risk group of covid-19 patients in the community. This suggests that infection with VOC-202012/1 may lead to substantial additional mortality compared with previously circulating variants, impacting healthcare capacity planning and control policies.

BMJ-BRITISH MEDICAL JOURNAL (2021)

Article Biochemistry & Molecular Biology

SARS-CoV-2 variants B.1.351 and P.1 escape from neutralizing antibodies

Markus Hoffmann et al.

Summary: The emerging SARS-CoV-2 variants may exhibit resistance to existing neutralizing antibodies and treatments, which could have significant implications for pandemic containment efforts.
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Antibody evasion by the P.1 strain of SARS-CoV-2

Wanwisa Dejnirattisai et al.

Summary: Ending the SARS-CoV-2 pandemic requires global vaccination. New virus strains with mutations impact antibody responses, but some variants are less resistant than others. A monoclonal antibody can neutralize different variants and partially restore neutralization potency for other public antibodies.
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Infection- and vaccine-induced antibody binding and neutralization of the B.1.351 SARS-CoV-2 variant

Venkata Viswanadh Edara et al.

Summary: Despite reduced antibody titers against the B.1.351 variant, sera from infected and vaccinated individuals containing polyclonal antibodies to the spike protein could still neutralize SARS-CoV-2 B.1.351, suggesting that protective humoral immunity may be retained against this variant.

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Effectiveness of the Comirnaty (BNT162b2, BioNTech/Pfizer) vaccine in preventing SARS-CoV-2 infection among healthcare workers, Treviso province, Veneto region, Italy, 27 December 2020 to 24 March 2021

Massimo Fabiani et al.

Summary: A study conducted in Italy showed that the BioNTech/Pfizer COVID-19 vaccine has an effectiveness of 84% and 95% in preventing SARS-CoV-2 infection within certain time intervals, supporting ongoing vaccination campaigns with targeted communication.

EUROSURVEILLANCE (2021)

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Neutralizing Antibodies Against SARS-CoV-2 Variants After Infection and Vaccination

Venkata Viswanadh Edara et al.

Summary: This study investigates the neutralizing antibody response to 4 SARS-CoV-2 variants in individuals who have been infected or vaccinated.

JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION (2021)

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Immunogenicity of a Single Dose of SARS-CoV-2 Messenger RNA Vaccine in Solid Organ Transplant Recipients

Brian J. Boyarsky et al.

JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION (2021)

Article Medicine, General & Internal

Association Between Vaccination With BNT162b2 and Incidence of Symptomatic and Asymptomatic SARS-CoV-2 Infections Among Health Care Workers

Yoel Angel et al.

Summary: This cohort study in Tel Aviv, Israel, found that vaccination with the Pfizer-BioNTech BNT162b2 vaccine was significantly associated with a lower incidence of symptomatic and asymptomatic SARS-CoV-2 infection among health care workers more than 7 days after the second dose.

JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION (2021)

Letter Medicine, General & Internal

Asymptomatic and Symptomatic SARS-CoV-2 Infections After BNT162b2 Vaccination in a Routinely Screened Workforce

Li Tang et al.

Summary: The study demonstrates an association between the Pfizer-BioNTech vaccine and decreased risk of symptomatic and asymptomatic infections with SARS-CoV-2 in hospital employees.

JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION (2021)

Article Immunology

BNT162b2 mRNA COVID-19 Vaccine Effectiveness in the Prevention of SARS-CoV-2 Infection: A Preliminary Report

Francesco Paolo Bianchi et al.

Summary: The study evaluated the effectiveness of the BNT162b2 mRNA vaccine against documented infection among healthcare workers from Bari Policlinico University Hospital, showing high effectiveness levels after vaccination. Concerns remain about unvaccinated healthcare workers during the pandemic emergency.

JOURNAL OF INFECTIOUS DISEASES (2021)

Article Medicine, General & Internal

Impact and effectiveness of mRNA BNT162b2 vaccine against SARS-CoV-2 infections and COVID-19 cases, hospitalisations, and deaths following a nationwide vaccination campaign in Israel: an observational study using national surveillance data

Eric J. Haas et al.

Summary: This study assessed the real-world effectiveness of the Pfizer-BioNTech mRNA COVID-19 vaccine BNT162b2 in Israel, showing high efficacy in preventing SARS-CoV-2 infections, hospitalizations, severe disease, and death. As vaccine coverage increased, there were marked declines in SARS-CoV-2 outcomes, indicating that COVID-19 vaccination can help control the pandemic.

LANCET (2021)

Article Medicine, General & Internal

Heterologous prime-boost COVID-19 vaccination: initial reactogenicity data

Robert H Shaw et al.

LANCET (2021)

Article Medicine, General & Internal

Efficacy of ChAdOx1 nCoV-19 (AZD1222) vaccine against SARS-CoV-2 variant of concern 202012/01 (B.1.1.7): an exploratory analysis of a randomised controlled trial

Katherine R. W. Emary et al.

Summary: A post-hoc analysis was conducted on the efficacy of the ChAdOx1 nCoV-19 vaccine against the B.1.1.7 variant of SARS-CoV-2 in the UK. The vaccine showed reduced neutralisation activity against the B.1.1.7 variant in vitro, but still demonstrated efficacy against the B.1.1.7 variant of the virus.

LANCET (2021)

Letter Infectious Diseases

SARS-CoV-2 B.1.1.7 and B.1.351 spike variants bind human ACE2 with increased affinity

Muthukumar Ramanathan et al.

LANCET INFECTIOUS DISEASES (2021)

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Safety and immunogenicity of one versus two doses of the COVID-19 vaccine BNT162b2 for patients with cancer: interim analysis of a prospective observational study

Leticia Monin et al.

Summary: The study aimed to evaluate the safety and immunogenicity of the BNT162b2 vaccine in cancer patients. The results showed poor efficacy of a single vaccine dose in cancer patients, with significantly increased immunogenicity in solid cancer patients after a vaccine boost at day 21. Therefore, it is recommended to prioritize cancer patients for an early second dose on day 21.

LANCET ONCOLOGY (2021)

Article Multidisciplinary Sciences

Escape of SARS-CoV-2 501Y.V2 from neutralization by convalescent plasma

Sandile Cele et al.

Summary: The study compared the neutralization of non-VOC and 501Y.V2 VOC variants using plasma from COVID-19 patients in South Africa. It found that plasma from individuals infected during the first wave effectively neutralized the first-wave virus variant, while plasma from those infected in the second wave effectively neutralized the 501Y.V2 variant.

NATURE (2021)

Article Biochemistry & Molecular Biology

Sensitivity of infectious SARS-CoV-2 B.1.1.7 and B.1.351 variants to neutralizing antibodies

Delphine Planas et al.

Summary: The ability of convalescent sera from individuals with coronavirus disease 2019 and those vaccinated with BNT162b2 to neutralize SARS-CoV-2 variants B1.1.7 and B.1.351 decreases, but increases after two vaccine doses. The study found that the B.1.1.7 and B.1.351 variants may have acquired partial resistance to neutralizing antibodies generated by natural infection or vaccination, particularly in individuals with low antibody levels. This suggests that the B.1.351 variant may pose a greater risk of infection in immunized individuals.

NATURE MEDICINE (2021)

Article Biochemistry & Molecular Biology

Initial report of decreased SARS-CoV-2 viral load after inoculation with the BNT162b2 vaccine

Matan Levine-Tiefenbrun et al.

Summary: COVID-19 vaccines not only provide protection to individual vaccinees, but may also reduce viral load in breakthrough infections, potentially leading to lower infectiousness and further suppressing virus spread.

NATURE MEDICINE (2021)

Article Biochemistry & Molecular Biology

Neutralizing antibody levels are highly predictive of immune protection from symptomatic SARS-CoV-2 infection

David S. Khoury et al.

Summary: The level of neutralizing antibodies is closely related to immune protection against COVID-19, playing a crucial role in protecting against detected infection and severe infection. Studies have shown that neutralizing titers will decline over time after vaccination, leading to decreased protection against SARS-CoV-2 infection.

NATURE MEDICINE (2021)

Article Medicine, General & Internal

Preliminary Findings of mRNA Covid-19 Vaccine Safety in Pregnant Persons

Tom T. Shimabukuro et al.

Summary: Preliminary data indicates that there are no obvious safety signals among pregnant women who received mRNA Covid-19 vaccines, but more data is needed for further confirmation. Adverse reactions such as injection-site pain were reported more frequently in pregnant women, but most pregnancies resulted in live births with some cases of preterm birth and small size for gestational age.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Letter Medicine, General & Internal

Effectiveness of the BNT162b2 Covid-19 Vaccine against the B.1.1.7 and B.1.351 Variants

Laith J. Abu-Raddad et al.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Letter Medicine, General & Internal

Neutralization of SARS-CoV-2 Variants B.1.429 and B.1.351

Xiaoying Shen et al.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Letter Medicine, General & Internal

SARS-CoV-2 Antibody Response in Persons with Past Natural Infection

Gabriele Anichini et al.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Letter Medicine, General & Internal

Neutralizing Response against Variants after SARS-CoV-2 Infection and One Dose of BNT162b2

Yaniv Lustig et al.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Letter Medicine, General & Internal

Susceptibility of Circulating SARS-CoV-2 Variants to Neutralization

Guo-Lin Wang et al.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Letter Medicine, General & Internal

BNT162b2-Elicited Neutralization against New SARS-CoV-2 Spike Variants

Yang Liu et al.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Article Medicine, General & Internal

Efficacy of the ChAdOx1 nCoV-19 Covid-19 Vaccine against the B.1.351 Variant

S. A. Madhi et al.

Summary: The ChAdOx1 nCoV-19 vaccine did not provide significant protection against mild-to-moderate Covid-19 caused by the B.1.351 variant, with an efficacy of 10.4%. The incidence of serious adverse events was balanced between the vaccine and placebo groups.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Letter Medicine, General & Internal

Antibody Persistence through 6 Months after the Second Dose of mRNA-1273 Vaccine for Covid-19

Nicole Doria-Rose et al.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Article Medicine, General & Internal

Efficacy of NVX-CoV2373 Covid-19 Vaccine against the B.1.351 Variant

V. Shinde et al.

Summary: The NVX-CoV2373 vaccine showed efficacy in preventing Covid-19, with higher vaccine efficacy observed among HIV-negative participants. Most infections were caused by the B.1.351 variant.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Article Multidisciplinary Sciences

mRNA vaccination boosts cross-variant neutralizing antibodies elicited by SARS-CoV-2 infection

Leonidas Stamatatos et al.

Summary: The study found that vaccination of both previously infected individuals and those who were not infected resulted in increased neutralizing antibody titers, with previously infected individuals showing a greater boost in neutralizing titers. Vaccination of naive individuals also elicited cross-neutralizing responses, but at lower titers.

SCIENCE (2021)

Article Multidisciplinary Sciences

Genomics and epidemiology of the P.1 SARS-CoV-2 lineage in Manaus, Brazil

Nuno R. Faria et al.

Summary: A new variant of concern, P.1, with 17 mutations including three spike protein mutations associated with increased binding to human ACE2 receptors, emerged in Manaus, Brazil between November 2020 and January 2021. Molecular analysis suggests P.1 may be 1.7- to 2.4-fold more transmissible and that previous infection may provide 54 to 79% protection against P.1 infection compared to other lineages. Enhanced global genomic surveillance of such variants is crucial for pandemic response.

SCIENCE (2021)

Article Medicine, General & Internal

Effectiveness of the Pfizer-BioNTech and Oxford-AstraZeneca vaccines on covid-19 related symptoms, hospital admissions, and mortality in older adults in England: test negative case-control study

Jamie Lopez Bernal et al.

Summary: This study estimated the real-world effectiveness of Pfizer-BioNTech BNT162b2 and Oxford-AstraZeneca ChAdOx1-S vaccines against confirmed COVID-19 symptoms, hospital admissions, and deaths. The vaccines showed significant reduction in symptomatic COVID-19 among older adults and further protection against severe disease. Both vaccines demonstrated similar effects and protection was maintained for over 6 weeks.

BMJ-BRITISH MEDICAL JOURNAL (2021)

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Effectiveness of Pfizer-BioNTech and Moderna Vaccines Against COVID-19 Among Hospitalized Adults Aged ≥65 Years — United States, January–March 2021

Mark W. Tenforde et al.

MMWR-MORBIDITY AND MORTALITY WEEKLY REPORT (2021)

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Distinct antibody and memory B cell responses in SARS-CoV-2 naive and recovered individuals after mRNA vaccination

Rishi R. Goel et al.

Summary: mRNA vaccines exhibit robust serological and cellular priming, with naïve individuals requiring two doses for optimal antibody responses, especially against the B.1.351 variant. Memory B cells specific for spike protein and RBD were efficiently primed by vaccination, while recovered individuals showed significant boosting after the first dose, correlating with preexisting memory B cell levels. Identifying distinct responses based on prior SARS-CoV-2 exposure suggests that recovered subjects may only need one vaccine dose for peak responses, which can inform vaccine distribution strategies in resource-limited settings.

SCIENCE IMMUNOLOGY (2021)

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SARS-CoV-2 Vaccine Effectiveness in a High-Risk National Population in a Real-World Setting

Adeel A. Butt et al.

Summary: The study evaluated the short-term effectiveness of SARS-CoV-2 vaccines in preventing infection in a real-world setting. The results showed that the currently used vaccines are highly effective in preventing confirmed infection in a high-risk population, whether it is the Pfizer-BioNTech BNT-162b2 vaccine or the Moderna mRNA-1273 vaccine.

ANNALS OF INTERNAL MEDICINE (2021)

Article Biochemistry & Molecular Biology

Reduced neutralization of SARS-CoV-2 B.1.617 by vaccine and convalescent serum

Chang Liu et al.

Summary: Recent study examined the neutralizing ability of monoclonal antibodies, convalescent and vaccine sera against the Indian variants B.1.617.1 and B.1.617.2, showing that the neutralization of these variants is reduced compared to the ancestral strains, without widespread antibody escape as seen in other variants like B.1.351.
Article Infectious Diseases

Vaccine effectiveness against infection with the Delta (B.1.617.2) variant, Norway, April to August 2021

Elina Seppala et al.

Summary: This population-based cohort study found that the vaccine effectiveness against the Delta variant was significantly lower for partially vaccinated individuals at 22.4% compared to 64.6% for fully vaccinated individuals, when compared to vaccine effectiveness against the Alpha variant at 54.5% and 84.4% respectively.

EUROSURVEILLANCE (2021)

Letter Medicine, General & Internal

Antibody Response After a Third Dose of the mRNA-1273 SARS-CoV-2 Vaccine in Kidney Transplant Recipients With Minimal Serologic Response to 2 Doses

Ilies Benotmane et al.

JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION (2021)

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Surveillance for Adverse Events After COVID-19 mRNA Vaccination

Nicola P. Klein et al.

Summary: This study conducted interim analysis of safety surveillance data of mRNA COVID-19 vaccines and found that the incidence of selected serious outcomes within 1-21 days post-vaccination was not significantly higher compared with 22-42 days post-vaccination. Surveillance is ongoing despite wide confidence intervals for many outcomes.

JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION (2021)

Article Medicine, General & Internal

Effect of 2 Inactivated SARS-CoV-2 Vaccines on Symptomatic COVID-19 Infection in Adults A Randomized Clinical Trial

Nawal Al Kaabi et al.

Summary: This interim analysis of an ongoing randomized trial in the UAE and Bahrain evaluated the efficacy of two inactivated COVID-19 vaccines in preventing symptomatic cases and adverse events in healthy adults. The study found that both vaccines significantly reduced the risk of symptomatic COVID-19 compared to the control group, with efficacy rates of 72.8% and 78.1%. Serious adverse events were rare across all groups.

JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION (2021)

Article Medicine, General & Internal

Safety and immunogenicity of heterologous versus homologous prime-boost schedules with an adenoviral vectored and mRNA COVID-19 vaccine (Com-COV): a single-blind, randomised, non-inferiority trial

Xinxue Liu et al.

Summary: Heterologous prime-boost COVID-19 vaccine schedules could facilitate mass immunisation, with ChAd/BNT showing non-inferior immunogenicity compared to ChAd/ChAd, but BNT/ChAd did not demonstrate non-inferiority to BNT/BNT. The results support flexibility in using heterologous prime-boost vaccination with ChAd and BNT COVID-19 vaccines.

LANCET (2021)

Article Medicine, General & Internal

Efficacy and safety of an inactivated whole-virion SARS-CoV-2 vaccine (CoronaVac): interim results of a double-blind, randomised, placebo-controlled, phase 3 trial in Turkey

Mine Durusu Tanriover et al.

Summary: The study presented the interim efficacy and safety results of the CoronaVac vaccine in a phase 3 clinical trial in Turkey, demonstrating high efficacy against PCR-confirmed symptomatic COVID-19 with good safety and tolerability profile. Results showed significant differences in the frequency of any adverse events between the vaccine and placebo groups, indicating excellent protective effects of the vaccine.

LANCET (2021)

Letter Infectious Diseases

Serum neutralising activity against SARS-CoV-2 variants elicited by CoronaVac

Yuxin Chen et al.

LANCET INFECTIOUS DISEASES (2021)

Article Multidisciplinary Sciences

BNT162b2-elicited neutralization of B.1.617 and other SARS-CoV-2 variants

Jianying Liu et al.

Summary: Serum samples from individuals vaccinated with the BNT162b2 vaccine can neutralize various SARS-CoV-2 variants, indicating mass immunization as a central strategy to end the global COVID-19 pandemic.

NATURE (2021)

Article Multidisciplinary Sciences

BNT162b2 vaccine induces neutralizing antibodies and poly-specific T cells in humans

Ugur Sahin et al.

Summary: The BNT162b2 vaccine shows 95% efficacy in preventing COVID-19 by boosting neutralizing antibody titres and activating specific T cell responses. The vaccine-induced immune response is broad and stable, lasting for a prolonged period, providing good coverage against various SARS-CoV-2 variants.

NATURE (2021)

Article Biochemistry & Molecular Biology

mRNA-1273 COVID-19 vaccine effectiveness against the B.1.1.7 and B.1.351 variants and severe COVID-19 disease in Qatar

Hiam Chemaitelly et al.

Summary: A study showed that the mRNA-1273 vaccine is highly effective against the B.1.1.7 and B.1.351 variants of concern, with efficacy rates of 100% and 96.4% respectively. The vaccine's effectiveness increases rapidly in the weeks following the first dose, reaching maximum efficacy after the second dose, providing strong protection against severe COVID-19 outcomes.

NATURE MEDICINE (2021)

Article Biochemistry & Molecular Biology

Effectiveness of the BNT162b2 mRNA COVID-19 vaccine in pregnancy

Noa Dagan et al.

Summary: The BNT162b2 COVID-19 vaccine showed high effectiveness in pregnant women in an observational cohort study in Israel, similar to the effectiveness seen in the general population.

NATURE MEDICINE (2021)

Article Biochemistry & Molecular Biology

Safety and immunogenicity of SARS-CoV-2 variant mRNA vaccine boosters in healthy adults: an interim analysis

Angela Choi et al.

Summary: The study demonstrates that both the mRNA-1273 COVID-19 vaccine and its variant-modified booster doses are safe and effective in improving neutralizing antibody titers against various virus variants.

NATURE MEDICINE (2021)

Letter Medicine, General & Internal

Effect of Vaccination on Transmission of SARS-CoV-2

Anoop S. V. Shah et al.

Summary: Vaccination of healthcare workers against SARS-CoV-2 in Scotland was found to reduce household transmission, indicating the positive impact of vaccination on curbing the spread of the virus.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Article Medicine, General & Internal

Effectiveness of an Inactivated SARS-CoV-2 Vaccine in Chile

Alejandro Jara et al.

Summary: A study in Chile involving 10.2 million participants assessed the effectiveness of an inactivated SARS-CoV-2 vaccine developed in China. Fully immunized individuals had vaccine effectiveness of 65.9% for preventing Covid-19 and 87.5% for preventing hospitalization, 90.3% for preventing ICU admission, and 86.3% for preventing death.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Article Medicine, General & Internal

Safety, Immunogenicity, and Efficacy of the BNT162b2 Covid-19 Vaccine in Adolescents

Robert W. Frenck et al.

Summary: The BNT162b2 vaccine showed favorable safety profile and a greater immune response in 12-to-15-year-old recipients compared to young adults, and demonstrated high effectiveness against Covid-19.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Article Medicine, General & Internal

Safety and Efficacy of NVX-CoV2373 Covid-19 Vaccine

Paul T. Heath et al.

Summary: The NVX-CoV2373 vaccine demonstrated an efficacy of 89.7% in a phase 3 trial with over 15,000 participants, with mild and transient reactogenicity. It showed high efficacy against the B.1.1.7 variant and a low incidence of adverse events.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Article Medicine, General & Internal

Effectiveness of mRNA Covid-19 Vaccine among US Health Care Personnel

T. Pilishvili et al.

Summary: The BNT162b2 and mRNA-1273 vaccines were highly effective in preventing symptomatic Covid-19 in U.S. health care personnel, with vaccine effectiveness of 77.6% to 96.3%. The effectiveness was consistent across different subgroups defined by age, race and ethnic group, underlying conditions, and patient contact levels, indicating the vaccines were effective for preventing Covid-19 in those at risk and in disproportionately affected groups.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Letter Medicine, General & Internal

Effect of Vaccination on Household Transmission of SARS-CoV-2 in England

Ross J. Harris et al.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Letter Medicine, General & Internal

Receipt of mRNA Covid-19 Vaccines and Risk of Spontaneous Abortion

Lauren H. Zauche et al.

Summary: The risk of spontaneous abortion in early pregnancy after receiving mRNA Covid-19 vaccination is consistent with historical data.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Letter Medicine, General & Internal

SARS-CoV-2 Neutralization with BNT162b2 Vaccine Dose 3

Ann R. Falsey et al.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Letter Medicine, General & Internal

Resurgence of SARS-CoV-2 Infection in a Highly Vaccinated Health System Workforce

Jocelyn Keehner et al.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Article Medicine, General & Internal

Protection of BNT162b2 Vaccine Booster against Covid-19 in Israel

Yinon M. Bar-On et al.

Summary: After receiving a third dose of the BNT162b2 mRNA vaccine, Israeli residents aged 60 and above who had previously received two doses of the vaccine saw significantly lower rates of confirmed Covid-19 infection and severe illness compared to those who did not receive a booster shot, indicating the effectiveness of the booster dose in reducing infection and severe illness.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Letter Medicine, General & Internal

Infection and Vaccine-Induced Neutralizing-Antibody Responses to the SARS-CoV-2 B.1.617 Variants

Venkata-Viswanadh Edara et al.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Article Medicine, General & Internal

Safety of the BNT162b2 mRNA Covid-19 Vaccine in a Nationwide Setting

Noam Barda et al.

Summary: The study found that after receiving the BNT162b2 vaccine, most adverse events were not associated with an increased risk, although there was a slight increase in the risk of myocarditis. On the other hand, infection with the Covid-19 virus significantly increased the risk of many serious adverse events.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Article Medicine, General & Internal

Prevention and Attenuation of Covid-19 with the BNT162b2 and mRNA-1273 Vaccines

Mark G. Thompson et al.

Summary: The study demonstrated that COVID-19 mRNA vaccines were highly effective in preventing SARS-CoV-2 infection in real-world conditions, while also attenuating the viral RNA load, febrile symptoms, and illness duration among vaccinated individuals who had breakthrough infections.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Article Medicine, General & Internal

Efficacy of the mRNA-1273 SARS-CoV-2 Vaccine at Completion of Blinded Phase

H. M. El Sahly et al.

Summary: The mRNA-1273 vaccine demonstrated high efficacy in preventing COVID-19 illness and severe disease, with more than 5 months of protection and a good safety profile, including protection against asymptomatic infection.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Article Medicine, General & Internal

Safety and Efficacy of the BNT162b2 mRNA Covid-19 Vaccine through 6 Months

S. J. Thomas et al.

Summary: BNT162b2 vaccine remains highly effective and safe over the course of 6 months post-vaccination, with efficacy rates ranging from 86% to 100% across different demographics and risk factors for Covid-19. The vaccine also shows a high efficacy against severe disease, with particularly promising results observed in South Africa against the B.1.351 variant.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

Article Multidisciplinary Sciences

SARS-CoV-2 immune evasion by the B.1.427/B.1.429 variant of concern

Matthew McCallum et al.

Summary: The novel CAL.20C (B.1.427/B.1.429) variant carries spike protein mutations, resulting in reduced neutralizing titers in vaccinated individuals and convalescent individuals. The L452R mutation reduces neutralizing activity in RBD-specific monoclonal antibodies, while the S13I and W152C mutations lead to the total loss of neutralization in NTD-specific antibodies due to antigenic supersite remodeling.

SCIENCE (2021)

Article Multidisciplinary Sciences

Durability of mRNA-1273 vaccine-induced antibodies against SARS-CoV-2 variants

Amarendra Pegu et al.

Summary: The study assessed the impact of SARS-CoV-2 variants on antibody responses induced by the mRNA vaccine over 7 months, showing that most individuals maintained binding and functional antibodies against variants, with B.1.351 having the lowest antibody recognition.

SCIENCE (2021)

Article Multidisciplinary Sciences

Two doses of SARS-CoV-2 vaccination induce robust immune responses to emerging SARS-CoV-2 variants of concern

Donal T. Skelly et al.

Summary: Vaccination with two doses generates more robust immune responses against emerging SARS-CoV-2 variants, particularly B.1.1.7 and B.1.351, compared to natural infection. High magnitude T cell responses are produced after two vaccine doses, mainly targeting conserved epitopes between the original isolate and the variants.

NATURE COMMUNICATIONS (2021)

Article Public, Environmental & Occupational Health

SARS-CoV-2 Infections and Hospitalizations Among Persons Aged ≥16 Years, by Vaccination Status — Los Angeles County, California, May 1–July 25, 2021

Jennifer B. Griffin et al.

MMWR-MORBIDITY AND MORTALITY WEEKLY REPORT (2021)

Article Public, Environmental & Occupational Health

New COVID-19 Cases and Hospitalizations Among Adults, by Vaccination Status — New York, May 3–July 25, 2021

Eli S. Rosenberg et al.

MMWR-MORBIDITY AND MORTALITY WEEKLY REPORT (2021)

Article Immunology

Side Effects Reported by Jordanian Healthcare Workers Who Received COVID-19 Vaccines

Osama Abu-Hammad et al.

Summary: The survey conducted among healthcare professionals who received COVID-19 vaccines in Jordan showed that around 18% and 31% reported no side effects after the first and second doses respectively. Most of the side effects were local, while systemic side effects like fatigue, myalgia, headache, and fever were more common after the first dose, particularly associated with the AstraZeneca vaccine and age <= 45 years. No serious side effects were reported, indicating that the side effects of COVID-19 vaccines in Jordan are similar to what have been known before. Further studies with larger sample sizes and longer follow-up periods are needed to monitor potential serious and long-term side effects.

VACCINES (2021)

Article Immunology

Neutralizing Activity of Sera from Sputnik V-Vaccinated People against Variants of Concern (VOC: B.1.1.7, B.1.351, P.1, B.1.617.2, B.1.617.3) and Moscow Endemic SARS-CoV-2 Variants

Vladimir A. Gushchin et al.

Summary: Since the beginning of 2021, all the main six vaccines against COVID-19 have been used in mass vaccination globally. Concerns have been raised regarding the decreasing virus neutralization and epidemiological efficacy against certain genotypes, and further studies are needed to determine the effectiveness of the Sputnik V vaccine against variants of concern.

VACCINES (2021)

Article Immunology

Effectiveness of BNT162b2 Vaccine in Adolescents during Outbreak of SARS-CoV-2 Delta Variant Infection, Israel, 2021

Aharona Glatman-Freedman et al.

Summary: In Israel, the BNT162b2 vaccine was approved for adolescents in June 2021, shortly before the outbreak of the Delta variant. A study found the vaccine to be highly effective in this population in the short term.

EMERGING INFECTIOUS DISEASES (2021)

Article Health Care Sciences & Services

Impact of original, B.1.1.7, and B.1.351/P.1 SARS-CoV-2 lineages on vaccine effectiveness of two doses of COVID-19 mRNA vaccines: Results from a nationwide case-control study in France

Tiffany Charmet et al.

Summary: The study found that in real-life settings, two doses of mRNA vaccines were effective against COVID-19 with the original virus, B.1.1.7 lineage, and B.1.351/P.1 lineages.

LANCET REGIONAL HEALTH-EUROPE (2021)

Article Medicine, General & Internal

ROCCA observational study: Early results on safety of Sputnik V vaccine (Gam-COVID-Vac) in the Republic of San Marino using active surveillance

Marco Montalti et al.

Summary: A study conducted in San Marino on Sputnik V vaccine recipients showed that it is well tolerated in individuals aged 60 years and above, with an AEFI incidence of around 76% for two-dose recipients.

ECLINICALMEDICINE (2021)

Article Multidisciplinary Sciences

SARS-CoV-2 B.1.617.2 Delta variant replication and immune evasion

Petra Mlcochova et al.

Summary: The B.1.617.2 (Delta) variant of SARS-CoV-2 has lower sensitivity to antibodies and higher replication efficiency compared to other lineages, which may contribute to its dominance and reduced vaccine effectiveness, highlighting the need for continued infection control measures post-vaccination.

NATURE (2021)

Article Immunology

Effectiveness of inactivated SARS-CoV-2 vaccines against the Delta variant infection in Guangzhou: a test-negative case-control real-world study

Xiao-Ning Li et al.

Summary: The two-dose inactivated SARS-CoV-2 vaccine showed an effectiveness of 59.0% to 70.2% against the Delta variant, with higher efficacy among participants aged 40-59 years and in females compared to males in preventing COVID-19 and moderate diseases.

EMERGING MICROBES & INFECTIONS (2021)

Article Multidisciplinary Sciences

No evidence for increased transmissibility from recurrent mutations in SARS-CoV-2

Lucy van Dorp et al.

NATURE COMMUNICATIONS (2020)

Editorial Material Multidisciplinary Sciences

History of vaccination

Stanley Plotkin

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2014)