Omicron variants: CDC finds fourth dose increases protection - CTV News

A study looking at the effectiveness of fourth doses of COVID-19 vaccines, run by the U.S. Centers for Disease Control and Prevention, has found that a second booster shot of an mRNA vaccine has significant effectiveness against severe illness with some Omicr…

A study looking at the effectiveness of fourth doses of COVID-19 vaccines, run by the U.S. Centers for Disease Control and Prevention (CDC), has found that a second booster shot of an mRNA vaccine ha… [+4822 chars]

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