But some experts said the new research did not support the decision to recommend booster shots for all Americans.
Taken together, the studies show that although the vaccines remain highly effective against hospitalizations, the bulwark they provide against infection with the virus has weakened in the past few months.
(Reuters) - The Biden administration plans to extend requirements for travellers to wear masks on airplanes, trains and buses and at airports and train stations through Jan. 18 to address COVID-19 risks, three sources told Reuters.
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