abstract
antivirus
attack
background
bacteria
bacterium
biology
blue
cancer
cell
cold
disease
epidemic
experiment
flu
genetic
green
growth
health
ill
illness
image
infection
influenza
life
magnification
medical
medicine
micro
microbe
microbiology
microscope
microscopic
organic
organism
research
sample
science
scientific
shape
sick
sickness
small
sphere
system
tiny
vein
viral
virus
white