Some Americans should get more than one shot of the updated COVID-19 vaccines because their age or certain health conditions make them more vulnerable to severe infections, U.S. health officials advised this week. Six months after their first shot, people 65 and older and those who are immunocompromised should receive a second dose of the vaccines that rolled out this fall, according to new guidance approved by a vaccine advisory panel and backed by the U.S. Centers for Disease Control and

Tag-uri: Coronavirus