US health official says Covid-19 boosters could risk more serious side effects

The

United States

is reviewing the need for a third Covid-19 booster

shot

among residents who have already been vaccinated but needs to see more data to know if additional shots could raise people's risk of serious side effects, a US health official said

Tuesday

.

The US

government

has not made a decision on whether to administer

booster

shots to residents but sees a greater potential need for them among the

elderly

and other groups at high risk for severe infection, said

Jay Butler

, deputy director at the US

Centers for Disease Control and Prevention

, during a media briefing.