The leading vaccine regulator at the Food and Drug Administration (FDA) has announced a far stricter course for federal vaccine approvals, following claims from his team that Covid vaccines were linked to the deaths of at least 10 children.

Experts suggest the announcement will make the vaccine approval process significantly more difficult.

Dr Vinay Prasad, whose vaccine policy direction has been supported by the US health secretary, Robert F Kennedy Jr , told FDA staff that the agency would rethink its approach to vaccination programs, according to an internal agency email circulated on Friday and later obtained by several media outlets.

Prasad said the agency plans to re-examine annual flu-shot policies, consider limits on simultaneous vaccinations, and require more robust safety an

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