doctor holding vaccine vial and syringe with doses for covid-19 and background dna and coronavirus

2019ncov antibodies atcg biochemist biomedical biotechnology booster care corona coronavirus covid covid19 development dna doctor dose drug engineering epidemiology genetic genome health helix illustration immunity immunization infection infectious investigation medication medicine microbiology microscope molecules mutation new research researcher rna sarscov2 scientist spiral spread vaccinating vaccination vaccine variant vial virology virus