transparent vial with usa,american flag.vaccine for covid-19 coronavirus, flu,infectious diseases.phonendoscope,syringe.injection

2019ncov america care clinical corona coronavirus country covid19 cure disease dose drug flu health hospital human illness immunity immunization infection influenza injection intramuscular laboratory mass medical medicine needle pandemic phonendoscop population research russia science scientist shot states syringe syringes test therapy transparent treatment trials united usa vaccination vaccine vial virus