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      Myocarditis after Covid-19 Vaccination in a Large Health Care Organization.

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          Abstract

          Reports have suggested an association between the development of myocarditis and the receipt of messenger RNA (mRNA) vaccines against coronavirus disease 2019 (Covid-19), but the frequency and severity of myocarditis after vaccination have not been extensively explored.

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

          Noa Dagan, Noam Barda, Eldad Kepten … (2021)
          Abstract Background As mass vaccination campaigns against coronavirus disease 2019 (Covid-19) commence worldwide, vaccine effectiveness needs to be assessed for a range of outcomes across diverse populations in a noncontrolled setting. In this study, data from Israel’s largest health care organization were used to evaluate the effectiveness of the BNT162b2 mRNA vaccine. Methods All persons who were newly vaccinated during the period from December 20, 2020, to February 1, 2021, were matched to unvaccinated controls in a 1:1 ratio according to demographic and clinical characteristics. Study outcomes included documented infection with the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), symptomatic Covid-19, Covid-19–related hospitalization, severe illness, and death. We estimated vaccine effectiveness for each outcome as one minus the risk ratio, using the Kaplan–Meier estimator. Results Each study group included 596,618 persons. Estimated vaccine effectiveness for the study outcomes at days 14 through 20 after the first dose and at 7 or more days after the second dose was as follows: for documented infection, 46% (95% confidence interval [CI], 40 to 51) and 92% (95% CI, 88 to 95); for symptomatic Covid-19, 57% (95% CI, 50 to 63) and 94% (95% CI, 87 to 98); for hospitalization, 74% (95% CI, 56 to 86) and 87% (95% CI, 55 to 100); and for severe disease, 62% (95% CI, 39 to 80) and 92% (95% CI, 75 to 100), respectively. Estimated effectiveness in preventing death from Covid-19 was 72% (95% CI, 19 to 100) for days 14 through 20 after the first dose. Estimated effectiveness in specific subpopulations assessed for documented infection and symptomatic Covid-19 was consistent across age groups, with potentially slightly lower effectiveness in persons with multiple coexisting conditions. Conclusions This study in a nationwide mass vaccination setting suggests that the BNT162b2 mRNA vaccine is effective for a wide range of Covid-19–related outcomes, a finding consistent with that of the randomized trial.
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            Safety of the BNT162b2 mRNA Covid-19 Vaccine in a Nationwide Setting

            Noam Barda, Noa Dagan, Yatir Ben-Shlomo … (2021)
            Background Preapproval trials showed that messenger RNA (mRNA)–based vaccines against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) had a good safety profile, yet these trials were subject to size and patient-mix limitations. An evaluation of the safety of the BNT162b2 mRNA vaccine with respect to a broad range of potential adverse events is needed. Methods We used data from the largest health care organization in Israel to evaluate the safety of the BNT162b2 mRNA vaccine. For each potential adverse event, in a population of persons with no previous diagnosis of that event, we individually matched vaccinated persons to unvaccinated persons according to sociodemographic and clinical variables. Risk ratios and risk differences at 42 days after vaccination were derived with the use of the Kaplan–Meier estimator. To place these results in context, we performed a similar analysis involving SARS-CoV-2–infected persons matched to uninfected persons. The same adverse events were studied in the vaccination and SARS-CoV-2 infection analyses. Results In the vaccination analysis, the vaccinated and control groups each included a mean of 884,828 persons. Vaccination was most strongly associated with an elevated risk of myocarditis (risk ratio, 3.24; 95% confidence interval [CI], 1.55 to 12.44; risk difference, 2.7 events per 100,000 persons; 95% CI, 1.0 to 4.6), lymphadenopathy (risk ratio, 2.43; 95% CI, 2.05 to 2.78; risk difference, 78.4 events per 100,000 persons; 95% CI, 64.1 to 89.3), appendicitis (risk ratio, 1.40; 95% CI, 1.02 to 2.01; risk difference, 5.0 events per 100,000 persons; 95% CI, 0.3 to 9.9), and herpes zoster infection (risk ratio, 1.43; 95% CI, 1.20 to 1.73; risk difference, 15.8 events per 100,000 persons; 95% CI, 8.2 to 24.2). SARS-CoV-2 infection was associated with a substantially increased risk of myocarditis (risk ratio, 18.28; 95% CI, 3.95 to 25.12; risk difference, 11.0 events per 100,000 persons; 95% CI, 5.6 to 15.8) and of additional serious adverse events, including pericarditis, arrhythmia, deep-vein thrombosis, pulmonary embolism, myocardial infarction, intracranial hemorrhage, and thrombocytopenia. Conclusions In this study in a nationwide mass vaccination setting, the BNT162b2 vaccine was not associated with an elevated risk of most of the adverse events examined. The vaccine was associated with an excess risk of myocarditis (1 to 5 events per 100,000 persons). The risk of this potentially serious adverse event and of many other serious adverse events was substantially increased after SARS-CoV-2 infection. (Funded by the Ivan and Francesca Berkowitz Family Living Laboratory Collaboration at Harvard Medical School and Clalit Research Institute.)
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              Myocarditis Following Immunization With mRNA COVID-19 Vaccines in Members of the US Military

              Jay Montgomery, Margaret Ryan, Renata Engler … (2021)
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                Author and article information

                Journal
                Journal ID (iso-abbrev): N Engl J Med
                Title: The New England journal of medicine
                Publisher: Massachusetts Medical Society
                ISSN (Electronic): 1533-4406
                ISSN (Print): 0028-4793
                Publication date (Electronic): December 02 2021
                Volume: 385
                Issue: 23
                Affiliations
                [1 ] From the Cardiology Department, Rabin Medical Center, Beilinson Hospital, Petah Tikva (G.W., S.H., I.R., M.W., Y.A., T.G., R.K.), the Faculty of Medicine, Tel Aviv University (G.W., S.H., I.R., M.W., Y.A., T.G., R.K.), and the Innovation Division, Clalit Research Institute, Clalit Health Services (N.B., O.A., N.D., R.D.B.), Tel Aviv, and the Department of Software and Information Systems Engineering (N.B., N.D.) and the School of Public Health, Faculty of Health Sciences (R.D.B.), Ben Gurion University, Be'er Sheva - all in Israel; and the Department of Biomedical Informatics, Harvard Medical School (N.B., N.D.), and the Ivan and Francesca Berkowitz Family Living Laboratory Collaboration at Harvard Medical School and Clalit Research Institute (N.B., N.D., R.D.B.) - both in Boston.
                Article
                DOI: 10.1056/NEJMoa2110737
                PMC ID: 8531986
                PubMed ID: 34614329
                SO-VID: 57e36475-83c9-4886-bb17-0f82a8b2a7d9
                Copyright © Copyright © 2021 Massachusetts Medical Society.
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