
(CNN)Covid-19 vaccines are protecting more than half the US population from current strains, experts say. But if too few people get vaccinated, the virus will be allowed to continue to spread — and … [+5889 chars]

(CNN)Covid-19 vaccines are protecting more than half the US population from current strains, experts say. But if too few people get vaccinated, the virus will be allowed to continue to spread — and … [+5889 chars]