3d
antibiotic
antibodies
artery
bacilli
bacteria
bacterial
bacterium
biological
biology
blood
bloodstream
bug
contagion
contamination
corkscrew
different
disease
endemic
epidemic
flu
germs
group
health
healthcare
ill
illness
illustration
immune
infected
infection
medical
microbes
microbiology
microorganism
microscopic
multiply
parasite
pathogenic
poisoning
science
sick
sickness
spirilla
spirillum
system
unhealthy
vessel
virus
weak