virus under microscope. antibodies and viral infection. immune defense of body. attack on antigens

abstract airborne antibodies antibody antigen antigens aquatic attack bacillus bacteria bacterial bacterium body cell closeup cold colony coronavirus defense disease epidemic epidemiology evolution genetic genome germs illustration immune immunity immunoglobulin infection infections inside macro medical micro microbe microbes microbiology microscope microscopic molecule mutation nano organism pandemic pathogen production research scientific toxin vaccine viral virology virus viruses wallpaper