leukocytes attack the virus in the blood. microbes under the microscope. disease, infection, inflammation

abstract analysis antibodies attack bacteria bacterium biology blood cell cells disease epidemic erythrocyte germs health healthcare human illness illustration immune immunity infection infectious inflammation intoxication leukocyte leukocytes lymphocyte macro medical microbe microbes microbiology microorganism microscope microscopic pathogen protection red resistance science subject system therapy toxicity vessel virus viruses white