allergen
allergy
anti
bacillus
bacteria
bacterial
bacterium
cancer
cell
contagion
disease
dust
flat
flu
fungus
germ
health
hiv
human
icon
illness
immune
infection
malware
medical
medicine
micro
microbe
microbes
microorganism
microscopic
mold
mould
organism
pandemic
parasitic
pest
pictogram
pollen
rabies
risk
sick
sign
silhouette
spore
symbol
viral
virion
virus