Microbe

Noun

 * 1)  Any microorganism, but specially said of those microorganisms which are harmful types of bacteria.

Thesaurus
adenovirus, aerobe, aerobic bacteria, aerobic organism, amoeba, anaerobe, anaerobic bacteria, anaerobic organism, autotrophic organism, bacillus, bacteria, bacterium, being, bug, coccus, creature, crumb, disease-producing microorganism, dot, drop, droplet, echovirus, enterovirus, filterable virus, fleck, flyspeck, fungus, genetic individual, germ, gnat, grain, gram-negative bacteria, gram-positive bacteria, heterotrophic organism, individual, iota, jot, living being, living thing, microorganism, midge, minim, minutia, minutiae, mite, mold, morphological individual, mote, nonfilterable virus, ont, organic being, organism, organization, particle, pathogen, physiological individual, picornavirus, pinhead, pinpoint, point, protozoa, protozoon, reovirus, rhinovirus, rickettsia, scrap, snip, snippet, speck, spirillum, spirochete, spore, staphylococcus, streptococcus, tittle, trypanosome, vanishing point, vibrio, virus, zooid, zoon