Metazoa-protozoa-bacteria interrelationships.
D000818:Animals; D004463:Ecology; D056890:Eukaryota; D005856:Germ-Free Life; D007421:Intestine, Small / Q000382:microbiology; D007778:Lactobacillus / Q000254:growth & development*; D007814:Larva / Q000302:isolation & purification; D008168:Lung / Q000382:microbiology; D051379:Mice; D009348:Nematoda; D014234:Trichinella