corona virus and bacteria medical concept

monochrome plant branch organ corona virus bacteria medical concept coronavirus bacterium disease biology science covid microbiology infection microbe vaccine medicine pandemic illness epidemic serum flu influenza cell molecule drug microscopic sick cancer blood death experiment genetic research diagnosis healthcare therapy lung quarantine spread micro treatment biotechnology hospital damage inflammation health hiv fever symptom respiratory allergy antivirus concepts field infectious diseases revolves diseases causative agents coronaviruses large family viruses cause animals humans bacteria single-celled microorganisms