a boy with medical mask on a white background. protection against pollution and viruses

2019 against analysis asian background biohazard boy breaking clean copyspace corona coronavirus coronavirusvaccine covid diagnosis disease doctor education epicentre fever flu grocery hairs healthcare hospital hygeine infection isolated lab male mask medical medicalmask model ncov negative news outbreak pandemic pollition pollution precautions protection protective research risk safe serious shop sign stayhome store test vaccine virus viruses washhands white whitebackground wuhan