aids
bacillus
background
bacteria
bacterium
cell
contagion
danger
disease
ebola
epidemic
flu
germ
germs
green
healthcare
hiv
illness
infect
infection
influenza
lights
magnification
medical
medicine
microbe
microbes
microbiology
microorganism
microscopic
organic
organism
outbreak
science
sick
sickness
spreading
strain
symptom
symptoms
transmit
virus
yellow