the beneficial bacteriophage virus in the human internal environment destroys harmful bacteria.

antibiotic attack bacteria bacterial bacteriophage bacterium beneficial biology blood body cancer cell contagion contagious destroys disease dna drug environment epidemic epidemiology flu harmful health human illustration infect infected infecting infection infectious internal invaders invasion macro medical medicine microbe microbiology microorganism microscope microscopic molecules nano organism pandemic phage science sickness surface therapy vaccine viral virology virus