HKUMed study reveals three or four doses of the Comirnaty or CoronaVac vaccines remain effective in preventing Omicron infection (but effectiveness dips below 36% about three months after the fourth injection)

HKUMed study reveals three or four doses of the Comirnaty or CoronaVac vaccines remain effective in preventing Omicron infection (but effectiveness dips below 36% about three months after the fourth injection)
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