The number of hospitalizations was 87 (82.9%) for myocarditis, 33 (38.8%) for pericarditis, and 90 (84.1%) for people who had both conditions. Nearly all of the cases (290, or 97.6%) involved an emergency department visit, with 210 cases (70.7%) also requiring hospital admission. Also, 207 (69.7%) of the cases occurred following the second vaccine dose. Of the 297 cases, 228 (76.8%) occurred in male recipients, and the median age of affected patients was 24 years (range, 12 to 81 years). Ontario's electronic reporting system revealed 297 cases of myocarditis or pericarditis among those vaccine recipients, or only about 15 cases per million vaccine doses. Five times higher rate with short dosing intervalįor the study, researchers from Public Health Ontario, the University of Toronto, and the nonprofit ICES analyzed data on 19,740,741 doses of mRNA COVID vaccine administered in the province from Dec 14, 2020-when vaccines were first available-to Sep 4, 2021. Myocarditis is an inflammation of the heart muscle, and pericarditis involves swelling of the thin membrane around the heart. Though both complications were rare, data from Ontario show higher rates of myocarditis and pericarditis with the Moderna COVID-19 vaccine than with the Pfizer-BioNTech vaccine, but the rates were lower for both vaccines if the spacing between receiving two doses was extended, according to a study late last week in JAMA Network Open.
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