attention
background
bacteria
bacterium
biology
cancer
cell
concept
danger
dangerous
disease
epidemic
flu
germ
germs
health
human
icon
illness
illustration
immune
infection
isolated
medical
medicine
micro
microbe
microbiology
microorganism
microscopic
organism
outbreak
protect
protection
research
risk
science
sign
silhouette
splash
symbol
technology
vaccine
viral
virus