Early Pfizer data has shown the vaccine — which is administered to younger kids at one-tenth the strength of the adult shot — is safe and produces an immune response.
But last year Pfizer announced the two-dose shot proved to be less effective at preventing COVID-19 in kids ages 2-5, and regulators encouraged the company to add a third dose to the study on the belief that another dose would boost the vaccine’s effectiveness much like booster doses do in adults.
The person spoke on the condition of anonymity to discuss sensitive regulatory issues. The person said the decreased effectiveness of the two-dose vaccine was not unexpected given the emergence of the highly transmissible omicron variant of COVID-19. Allowing young kids to be vaccinated with a two-dose shot earlier would ultimately accelerate when they could get the expected stronger protection from a third dose.
Young children are far less likely than adults to develop serious complications or to die from COVID-19, but incidences of illness among the age group have risen amid the nationwide spike in cases from the omicron variant. Most cases and deaths occur among older people, especially those who are unvaccinated.
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