close up of a micro insect, a kind of parasite, under microscope - infection

bacteriologic toxic biological bacteria unsafe bacterium microscopic parasite hazard pestilence pathogen inflammation contaminated outbreak bacterial pathogenic magnification scourge germ virus risk contamination infestation parasitic microscope unwell invasion germs infections afflictions fungal unhealthy noxious pollution infectious contaminate contagion infect perilous illness polluted afflicted sickness insect pathologic cell infective unfit destructive microbe contagious threat baneful affliction toxin pestilential peril health disease host unsanitary microscopy ill morbid ailment spread infected tissue hostile tainted epidemic unwholesome danger plague infection sick malignant ills diseased pest