researcher holding vaccine jn.1 covid-19 omicron subvariant virus

vaccine vaccination covid19 virus variant researcher analyzing coronavirus jn1 pirola development health care syringe variation flu pathogen immunology infection immunologic injection healthcare disease omicron diagnosis microbiology research contagion microorganisms viruses cellular virology antigen bacteria corona immunological system antibodies diagnostic immune cells erythrocytes molecular invasive biological infectious microbe transmission human miscroscopic red