3d
abstract
analysis
antibody
bacteria
bacterium
biology
blood
cancer
cell
danger
death
disease
epidemic
flu
germ
health
hiv
human
illness
illustration
immune
immunity
infection
infectious
isolated
leukocyte
macro
medical
medicine
microbe
microbiology
microorganism
microscopic
organism
outbreak
pathogen
protection
research
resistance
science
shape
sick
sickness
therapy
vessel
viral
virology
virus