A study found elevated levels of spike protein circulating in the bloodstream of individuals who developed postvaccine myocarditis after receiving the Pfizer and Moderna COVID-19 vaccines, which might potentially contribute to myocarditis by causing inflammation.
The protection provided by a second COVID-19 vaccine booster was worse than that bestowed by an initial booster, with the shielding trending negative after a period of time, according to a new study.
Pfizer and its German partner have asked U.S. regulators to clear their updated COVID-19 vaccine for children as young as 6 months of age, the companies announced on Dec. 5.