Pfizer Covid vaccine is less effective in kids 5 to 11, study finds

New data suggest the Pfizer-BioNTech Covid vaccine works substantially less well at preventing infection and hospitalizations in kids 5 to 11.

Newly emerging data suggest the Pfizer-BioNTech Covid vaccine works substantially less well at preventing infection and hospitalizations in children aged 5 to 11 than it does in those aged 12 to 17 — a finding that is raising questions about whether the companies chose the wrong dose for the younger children.

The data, from New York state, show a rapid and substantial decline in protection after vaccination in children in the younger age group, with efficacy against infections dropping off more quickly and dramatically than the declines seen in children aged 12 to 17. The study also found a significant, but less steep, decline in protection against hospitalizations.

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