microbion
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
microphyte
microzyme
midge
minim
minutia
minutiae
mite
Cyanobacteria
algae
bacilli
cockroach
contagion
contaminant
flea
infection
microorganisms
mosquito
parasite
pest
protozoa
spore
toxin
vermin
virus
wildlife