bacterial infection in the blood. viruses attack the human body. microorganisms, germs and microbes

abstract analysis antibody attack bacteria bacterial bacterium biology blood body cell cells closeup colorful disease epidemic erythrocyte flu germs health healthcare hiv human illness illustration immune immunity infection infectious intoxication leukocytes lymphocyte macro medical medicine microbe microbes microbiology microorganisms microscope microscopic pathogen red research resistance science therapy toxicity vessel viral virology virus viruses