Pfizer's Covid-19 vaccine is more than 90 percent effective in preventing symptomatic forms of the disease in children aged 5 to 11, the company said in a document released Friday.
The new data were published on the website of the Food and Drug Administration, which has called an advisory panel of independent experts to meet Tuesday to decide whether to authorize the vaccine in this age group.
"VE (Vaccine Efficacy) against laboratory-confirmed symptomatic Covid-19 occurring at least 7 days after Dose 2 in evaluable participants without evidence of prior SARS-CoV-2 infection was 90.7%," the document said.
There were no cases of severe Covid and no cases of multisystem inflammatory syndrome in children (MIS-C), a rare but serious post viral condition.
There were no cases of myocarditis or pericarditis (heart inflammation or inflammation around the heart) -- but there are not enough study volunteers to be able to detect highly rare side effects, and male adolescents are thought to be a higher risk group.
This is the first time Pfizer has released an efficacy estimate for its Covid vaccine in younger children. Its earlier press statement only said the shot produced a robust immune response.
The vaccine was tested with a 10 microgram dose, while older age groups have received 30 micrograms.