collection of positive and negative results of covid-19 coronavirus sars-cov-2 rapid antigen ag test made by nasal swab

positive negative sars-cov-2 rapid antigen test nasal swab held medical personnel covid-19 coronavirus isolated blurred background analyzing cassette contagion contagious contamination corona global crisis diagnosis diagnostic disease epidemic equipment health hospital hubei illustrative infection lab laboratory outbreak pandemic patient tested pneumonia result sample sars selective focus specimen kit viral virus spread collection cassettes kits diagnoses chinese infected