New Delhi, Aug. 28 -- The US Food and Drug Administration on Wednesday (August 27) approved updated COVID-19 vaccines from Pfizer, Moderna, and Novavax but narrowed their recommended use, particularly for younger adults and children. The changes mark a significant shift from previous guidance, which recommended annual shots for all Americans six months and older.

The new guidance allows all seniors to receive the updated vaccines, but younger adults and children may only be vaccinated if they have at least one high-risk health condition, such as asthma or obesity. Pfizer's vaccine will no longer be available for children under five, as the FDA revoked its emergency use authorization for that age group. Moderna's Spikevax remains availabl...