First-dose mRNA vaccination is sufficient to reactivate immunological memory to SARS-CoV-2 in subjects who have recovered from COVID-19

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)

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Article Multidisciplinary Sciences

Immunological memory to SARS-CoV-2 assessed for up to 8 months after infection

Jennifer M. Dan et al.

Summary: Different components of immune memory to SARS-CoV-2 exhibit distinct kinetics, with antibodies and spike-specific memory B cells remaining relatively stable over 6 months, while CD4(+) T cells and CD8(+) T cells declining with a half-life of 3 to 5 months after infection.

SCIENCE (2021)

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Letter Medicine, General & Internal

Antibody response to first BNT162b2 dose in previously SARS-CoV-2-infected individuals

Charlotte Manisty et al.

LANCET (2021)

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Letter Medicine, General & Internal

Effect of previous SARS-CoV-2 infection on humoral and T-cell responses to single-dose BNT162b2 vaccine

Maria Prendecki et al.

LANCET (2021)

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Letter Medicine, General & Internal

Early rate reductions of SARS-CoV-2 infection and COVID-19 in BNT162b2 vaccine recipients

Sharon Amit et al.

LANCET (2021)

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Article Infectious Diseases

Transmission of COVID-19 in 282 clusters in Catalonia, Spain: a cohort study

Michael Marks et al.

Summary: The viral load of index cases is a key driver of SARS-CoV-2 transmission, while the viral load of contacts at baseline is strongly associated with the risk of developing symptomatic COVID-19 and shortening the incubation period in a dose-dependent manner.

LANCET INFECTIOUS DISEASES (2021)

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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.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

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Letter Medicine, General & Internal

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

Florian Krammer et al.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

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Review Immunology

SARS-CoV-2 vaccines strategies: a comprehensive review of phase 3 candidates

Nikolaos C. Kyriakidis et al.

Summary: The new SARS-CoV-2 virus is rapidly spreading worldwide, causing the COVID-19 pandemic with more than 1.866 million deaths. Over 64 vaccine candidates are being developed globally, aiming to induce antibodies to prevent viral entry. Thirteen vaccine candidates are currently in Phase 3 clinical trials, showing promising progress towards approval for large-scale immunizations.

NPJ VACCINES (2021)

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Letter Medicine, General & Internal

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

Todd Bradley et al.

Summary: A small study found that antibody responses significantly increased in healthcare workers after receiving a single dose of the SARS-CoV-2 vaccine, including antibodies to spike protein subunits S1 and S2, as well as the receptor-binding domain.

NEW ENGLAND JOURNAL OF MEDICINE (2021)

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Article Medicine, Research & Experimental

One dose of SARS-CoV-2 vaccine exponentially increases antibodies in individuals who have recovered from symptomatic COVID-19

Riccardo Levi et al.

Summary: A study showed that individuals with prior exposure to SARS-CoV-2 had a significant increase in antibody response within 5 to 18 days after receiving the Pfizer/BioNTech vaccine. Symptomatic individuals reached a high titer of antibodies with just one dose, suggesting that a second dose may not be necessary.

JOURNAL OF CLINICAL INVESTIGATION (2021)

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Article Immunology

Heterogeneous magnitude of immunological memory to SARS-CoV-2 in recovered individuals

Alessio Mazzoni et al.

Summary: The study assessed the maintenance of long-term virus-specific cellular and humoral immune response to SARS-CoV-2 in COVID-19 recovered individuals, finding heterogeneous levels of immunological memory at 5 months post-infection. Some recovered subjects may be at higher risk of reinfection, with symptomatic COVID-19 patients showing higher levels of specific immune response compared to asymptomatic individuals.

CLINICAL & TRANSLATIONAL IMMUNOLOGY (2021)

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Editorial Material Medicine, General & Internal