Pfizer Says Its Low-Dose Vaccine Doesn’t Work in Kids Aged 2–5

To test 3rd COVID-19 shot for kids under 5

A nurse prepares a dose of a COVID-19 vaccine to be injected at the Andras Josa Teaching Hospital in Nyiregyhaza, Hungary, on Jan. 24, 2021. Attila Balazs/MTI via AP, File

A low dose of the Pfizer-BioNTech COVID-19 vaccine didn’t produce a significant immune response among children between the ages of 2 and 5, the two firms said on Friday.

Amid clinical trials that are ongoing, the two drugmakers tested 3 micrograms of the vaccine in kids aged 6 months to less than 5 years of age. Children between 6 months and 2 years produced an immune response comparable to individuals aged 16 to 25 years after two adult doses of the mRNA vaccine (30 micrograms), the companies said.