3d
balantidiasis
balantidium
biology
cilia
ciliated
coli
cytostome
drink
food
human
illustration
infection
intestinal
intestine
macronucleus
medical
medicine
microbe
microbiology
micronucleus
microorganism
morphology
nucleus
parasite
parasitology
pigs
protozoan
tract
transmission
ulcer
vacuole
water