doctor holding tube with nasal swab and requisition form for analysis of covid-19 or coronavirus test

acid amplification analysis antigen antigens biochemistry checklist coronavirus cotton covid covid19 delta diagnostic disease doctor exam fluid form genetic healthcare iga igg igm immunity infection laboratory medical molecular mutation naat nasal new nucleic omicron patient pcr protein reinfection request requisition research rna sample sarscov2 serology strain swab test testing throat tube variant viral virology virus