doctor at appointment or scientist microbiologist virologist shows model of microorganism - virus prion or bacteria. demonstration

abdominal adenovirus agent appointment bacteria causative cause chickenpox chronic contagiosum contagious coronavirus cramps demonstration diarrhea disease doctor fatigue flu hepatitis herpes infection malaise measles microbiologist microorganism model molluscum norovirus pathogen patient physician polio prion roseola rotavirus rubella science scientist shingles show smallpox study syndrome virologist virus visit