hands of a doctor dosing into the syringe a dose of the fourth dose of the covid-19 vaccine

2019ncov 4rd 4th antibodies antigens booster bottle bq1 care corona coronavirus covid covid19 doctor dose dosing drug fourth hands health healthcare immunity immunization injection label labeled laboratory medical medication mrna new omicron patients pharmaceutical report sarscov2 shot shots syringe vaccinating vaccination vaccine vaccines variant variants vial virology virus