Both Pfizer and Moderna are launching clinical trials to track health issues — if any — in the years following a diagnosis of vaccine-associated heart problems in teens and young adults.
A study by Canadian researchers published Monday in the Journal of thefound that men younger than 40 who got the Moderna vaccine had the highest risk of heart issues, usually within 21 days after the second dose. The study was observational, meaning it doesn’t prove cause and effect but it is one of only a few studies to compare the risk of myocarditis between the Pfizer and the Moderna vaccines.
It’s unknown how many people with vaccine-associated myocarditis will experience this scarring, he said, noting that about 20% of people with myocarditis linked to viruses go on to experience heart failure. Are some patients at higher risk for heart issues, such as arrhythmias? Dr. Dongngan Truong, a pediatrician at the University of Utah Health, said Pfizer researchers will be trying to determine the factors., will be monitoring participants for five years, according to Truong, a co-lead on the Pfizer study. The Pfizer study will include people who were previously hospitalized with vaccine-associated myocarditis, and it will also follow those who were more recently diagnosed.
, including BQ.1 and BQ.1.1, have begun circulating widely in the U.S., increasing the risk of reinfections, particularly for those who haven't yet received a booster dose.
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