free-floating and glowing virus cells

abstract africa aids and background bacteria bacterium biology blood cancer cell cells cold colds contagious death disease disinfected ebola epidemic experiment floating flu free germ glowing health hospital human illness illustration immune incubation infection infectious infective life macro medical medicine microbes microbiology microscopic molecules organic organism organs outbreak parasite patient plague plaque receptors red research science scientific sensors sick sickness spread suffering symptoms system vaccine vein viral virology virus