examination of mucosal smears. the scientist is holding a test tube. study of viruses in sputum of the lungs. test for flu or

aids analysis assay cervical coronavirus covid cytosmear disease doctor empty epidemic examination gonorrhea hiv hospital infection lab laboratory laryngeal medicine mers microbiology nasal nasopharynx nose oral pernasal pharyngeal pharynx protection protective research sars scientist smear snivel snot specimen suit survey swab swabbing swob take tampon test throat tube vaginal virus