US Centers for Disease Control and Prevention Director Dr. Rochelle Walensky endorsed on Friday the use of a third dose of coronavirus vaccine in immunocompromised people.
The White House COVID-19 response team on Thursday outlined grim coronavirus trends showing how the delta variant has strengthened its grip on the country, especially among unvaccinated populations.
LONDON — Achieving herd immunity with Covid vaccines when the highly infectious delta variant is spreading is “not a possibility,” a leading epidemiologist said.
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