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The risk of miscarriage following COVID-19 vaccination: a systematic review and meta-analysis

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Characteristics and perceptions associated with COVID-19 vaccination hesitancy among pregnant and postpartum individuals: A cross-sectional study

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Summary: This study assessed the frequency and characteristics of COVID-19 vaccine hesitancy among pregnant and postpartum individuals. The results showed that individuals with certain sociodemographic characteristics were more likely to express vaccine hesitancy, while those who had family or friends vaccinated for COVID-19, planned vaccination for other vaccines, and perceived vaccination to benefit the baby were less likely to express COVID-19 vaccine hesitancy.

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Sarah J. Stock et al.

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In Vitro Fertilization and Early Pregnancy Outcomes After Coronavirus Disease 2019 (COVID-19) Vaccination

Devora Aharon et al.

Summary: This retrospective study examined the association between COVID-19 mRNA vaccination and controlled ovarian hyperstimulation or early pregnancy outcomes. The study found no adverse effects of COVID-19 vaccination on stimulation or early pregnancy outcomes in women undergoing assisted reproductive techniques.

OBSTETRICS AND GYNECOLOGY (2022)

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Charles Egloff et al.

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PLOS ONE (2022)

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Association of BNT162b2 COVID-19 Vaccination During Pregnancy With Neonatal and Early Infant Outcomes

Inbal Goldshtein et al.

Summary: This large population-based study found no evident differences between newborns of women who received BNT162b2 mRNA vaccination during pregnancy, vs those of women who were not vaccinated, and contributes to current evidence in establishing the safety of prenatal vaccine exposure to the newborns. Interpretation of study findings is limited by the observational design.

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No Effect of Inactivated SARS-CoV-2 Vaccination on in vitro Fertilization Outcomes: A Propensity Score-Matched Study

Jialyu Huang et al.

Summary: This study found that inactivated SARS-CoV-2 vaccination did not have any measurable detrimental effects on in vitro fertilization (IVF) outcomes in females. The number of eggs retrieved, good-quality embryo rate, and clinical pregnancy rate were similar between vaccinated and unvaccinated groups. The results were consistent when considering the timing of vaccination in relation to the IVF cycle initiation.

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Coronavirus disease 2019 vaccination and infertility treatment outcomes

Sarit Avraham et al.

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Association of COVID-19 Vaccination in Pregnancy With Adverse Peripartum Outcomes

Deshayne B. Fell et al.

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Association of SARS-CoV-2 Vaccination During Pregnancy With Pregnancy Outcomes

Maria C. Magnus et al.

Summary: This population-based study conducted in Sweden and Norway showed that vaccination against SARS-CoV-2 during pregnancy, compared with no SARS-CoV-2 vaccination during pregnancy, was not significantly associated with an increased risk of adverse pregnancy outcomes. The majority of vaccinations were administered with mRNA vaccines during the second and third trimesters of pregnancy, which should be considered when interpreting the findings.

JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION (2022)

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Post-authorization surveillance of adverse events following COVID-19 vaccines in pregnant persons in the vaccine adverse event reporting system (VAERS), December 2020-October 2021

Pedro L. Moro et al.

Summary: Background: Pregnant persons are at increased risk of severe illness from COVID-19 infection. Limited data are available on the safety of COVID-19 vaccines during pregnancy. Objective: To evaluate the safety of COVID-19 vaccines in pregnant persons using reports to the Vaccine Adverse Event Reporting System (VAERS). Results: Reports to VAERS did not identify any concerning patterns of maternal or infant-fetal outcomes. Conclusion: COVID-19 vaccines appear to be safe in pregnant persons based on the reviewed reports.

VACCINE (2022)

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The Risk of Spontaneous Abortion Does Not Increase Following First Trimester mRNA COVID-19 Vaccination

Ioana Mihaela Citu et al.

Summary: Clinical trials initially excluded pregnant women from COVID-19 vaccination, but observational studies found that pregnant women infected with COVID-19 had higher risks of negative pregnancy outcomes. Research showed that the risk of spontaneous abortion after mRNA COVID-19 immunization during the first trimester of pregnancy is comparable to the predicted risk in non-vaccinated pregnant women.

JOURNAL OF CLINICAL MEDICINE (2022)

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Effects and safety of COVID-19 vaccination on assisted reproductive technology and pregnancy: A comprehensive review and joint statements of the KSRM, the KSRI, and the KOSAR

Ae Ra Han et al.

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Guillaume Favre et al.

Summary: Safety of mRNA COVID-19 vaccines in pregnancy was assessed in this study. The results showed that although common local and systemic reactions were reported during vaccine administration, severe events were rare. Women vaccinated during pregnancy did not experience higher adverse pregnancy or neonatal outcomes compared to historical data on background risks in the obstetric population.

LANCET REGIONAL HEALTH-EUROPE (2022)

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No crossreactivity of anti-SARS-CoV-2 spike protein antibodies with Syncytin-1

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Vaccines-safety in pregnancy

Mala Arora et al.

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BEST PRACTICE & RESEARCH CLINICAL OBSTETRICS & GYNAECOLOGY (2021)

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Fertility rates and birth outcomes after ChAdOx1 nCoV-19 (AZD1222) vaccination

Kushalinii Hillson et al.

LANCET (2021)

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No link between COVID-19 vaccines and early pregnancy loss

[Anonymous]

MEDICAL JOURNAL OF AUSTRALIA (2021)

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Early exploration of COVID-19 vaccination safety and effectiveness during pregnancy: interim descriptive data from a prospective observational study

Inna Bleicher et al.

Summary: The study found that receiving mRNA vaccine during pregnancy does not increase the risk of pregnancy complications and is effective in preventing COVID-19 infection.

VACCINE (2021)

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Measuring the impact of COVID-19 vaccine misinformation on vaccination intent in the UK and USA

Sahil Loomba et al.

Summary: Recent online misinformation about COVID-19 vaccines has been found to decrease intent to vaccinate among adults in the UK and the USA, particularly among those who were initially willing to get vaccinated. Certain sociodemographic groups are more negatively impacted by misinformation, and scientifically-sounding misinformation has a stronger effect on reducing vaccination intent.

NATURE HUMAN BEHAVIOUR (2021)

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Kathryn J. Gray et al.

Summary: The study found that pregnant and lactating women had equivalent antibody titers after receiving the coronavirus disease 2019 mRNA vaccine compared to nonpregnant women, and these titers were higher than those induced by natural infection. Vaccine-induced antibodies were present in umbilical cord blood and breastmilk samples, transferring immunity to neonates through placenta and breastmilk.

AMERICAN JOURNAL OF OBSTETRICS AND GYNECOLOGY (2021)

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The impact of COVID-19 on pregnancy outcomes: a systematic review and meta-analysis

Shu Qin Wei et al.

Summary: Infection with COVID-19 during pregnancy may lead to an increased risk of preeclampsia, preterm birth, and other adverse pregnancy outcomes. Severe cases of COVID-19 are particularly associated with higher risks of complications such as preeclampsia, preterm birth, gestational diabetes, and low birth weight.

CANADIAN MEDICAL ASSOCIATION JOURNAL (2021)

Review Medicine, General & Internal

Miscarriage matters: the epidemiological, physical, psychological, and economic costs of early pregnancy loss

Siobhan Quenby et al.

Summary: Miscarriage, characterized by the loss of a pregnancy before viability, has a significant global impact with a high occurrence rate and various risk factors. It can result in both physical and psychological consequences for individuals, highlighting the importance of providing mental health support and specialized obstetric care for women who have experienced miscarriage.

LANCET (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)

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)

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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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The PRISMA 2020 statement: an updated guideline for reporting systematic reviews

Matthew J. Page et al.

Summary: The PRISMA statement was designed to help systematic reviewers transparently report the purpose, methods, and findings of their reviews. The updated PRISMA 2020 statement includes new reporting guidance, a 27-item checklist, an abstract checklist, and revised flow diagrams for reviews.

BMJ-BRITISH MEDICAL JOURNAL (2021)

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Exaptation of Retroviral Syncytin for Development of Syncytialized Placenta, Its Limited Homology to the SARS-CoV-2 Spike Protein and Arguments against Disturbing Narrative in the Context of COVID-19 Vaccination

Malgorzata Kloc et al.

Summary: The alleged similarity between syncytin and the SARS-CoV-2 spike protein is unlikely to cause fertility and pregnancy issues with SARS-CoV-2 vaccines, due to low sequence similarity. More evaluation is needed on potential impacts of COVID-19 vaccines on fertility, placental formation, pregnancy, and overall health of mothers and newborns. The evolution of syncytin and its role in placenta formation through exaptation is also discussed.

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MRNA COVID-19 VACCINES DO NOT COMPROMISE IMPLANTATION OF EUPLOID EMBRYOS

Devora Aharon et al.

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Letter Medicine, General & Internal

Spontaneous Abortion Following COVID-19 Vaccination During Pregnancy

Elyse O. Kharbanda et al.

JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION (2021)

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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)

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Short-term outcome of pregnant women vaccinated with BNT162b2 mRNA COVID-19 vaccine

S. Bookstein Peretz et al.

Summary: This observational study compared the immunogenicity and reactogenicity of the Pfizer/BioNTech BNT162b2 mRNA COVID-19 vaccine between pregnant and non-pregnant women. The study found that pregnant women experienced similar rates of adverse effects following vaccination as non-pregnant women, with lower levels of SARS-CoV-2 IgG. The vaccine was effective in generating a humoral immune response in pregnant women, with no safety concerns identified.

ULTRASOUND IN OBSTETRICS & GYNECOLOGY (2021)

Letter Medicine, General & Internal

Short-term Reactions Among Pregnant and Lactating Individuals in the First Wave of the COVID-19 Vaccine Rollout

Alisa Kachikis et al.

Summary: This cohort study compared short-term reactions following COVID-19 vaccination between pregnant and lactating individuals and those who are not pregnant or lactating but planning pregnancy.

JAMA NETWORK OPEN (2021)

Letter Obstetrics & Gynecology

COVID-19 vaccination in pregnancy: early experience from a single institution

Megan E. Trostle et al.

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Elucidating reasons of COVID-19 re-infection and its management strategies

Vijay Kumar Jain et al.

Summary: This study found that the main reasons for COVID-19 reinfection may include the emergence of variant viruses, pandemic fatigue, and disregard for infection prevention strategies. Therefore, it is necessary to take COVID Appropriate Behavior, promote vaccine improvement, and enhance global vaccination efforts to mitigate this global threat.

DIABETES & METABOLIC SYNDROME-CLINICAL RESEARCH & REVIEWS (2021)

Letter Medicine, General & Internal

Covid-19 Vaccination during Pregnancy and First-Trimester Miscarriage

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NEW ENGLAND JOURNAL OF MEDICINE (2021)

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A core outcome set for pre-eclampsia research: an international consensus development study

J. M. N. Duffy et al.

BJOG-AN INTERNATIONAL JOURNAL OF OBSTETRICS AND GYNAECOLOGY (2020)

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COVID-19 pandemic: perspectives on an unfolding crisis

A. Spinelli et al.

BRITISH JOURNAL OF SURGERY (2020)

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Susceptibility to misinformation about COVID-19 around the world

Jon Roozenbeek et al.

ROYAL SOCIETY OPEN SCIENCE (2020)

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Core Outcome Sets in Miscarriage Trials (COSMisT) study: a study protocol

Paul Smith et al.

BMJ OPEN (2017)

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ROBINS-I: a tool for assessing risk of bias in non-randomised studies of interventions

Jonathan A. C. Sterne et al.

BMJ-BRITISH MEDICAL JOURNAL (2016)

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ROBINS-I: a tool for assessing risk of bias in non-randomised studies of interventions

Jonathan A. C. Sterne et al.

BMJ-BRITISH MEDICAL JOURNAL (2016)

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Structural characterization of the fusion core in syncytin, envelope protein of human endogenous retrovirus family W

R Gong et al.

BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS (2005)

Review Obstetrics & Gynecology

Risk factors in miscarriage:: a review

A García-Enguídanos et al.

EUROPEAN JOURNAL OF OBSTETRICS & GYNECOLOGY AND REPRODUCTIVE BIOLOGY (2002)