The Pfizer /BioNTech COVID-19 vaccine showed 90.7% efficacy against the coronavirus in a clinical trial of children 5 to 11 years old, the U.S. drugmaker said on Friday.
COVID-19
Pfizer's clinical trial in those 5 to 11 years old was not primarily designed to measure efficacy against the virus. Instead, it compared the amount of neutralizing antibodies induced by the vaccine in the children to the response of older recipients in their adult trial.induced a robust immune response in the children.
Pfizer also said on Friday that it had expanded its clinical trial to improve its safety data, more than doubling the number of children enrolled. Pfizer suggested that the rate of myocarditis in the age group was likely to be lower than observed in vaccinated 12 to 15 year olds. It also estimated that the number of COVID-related hospitalizations prevented by vaccination was many times the number of potential cases of myocarditis.
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