The influence of the environment on avian leucosis.
D000818:Animals; D001353:Avian Leukosis / Q000453:epidemiology*; D001358:Avian Sarcoma Viruses / Q000276:immunology; D003048:Coccidiosis / Q000662:veterinary; D004777:Environment; D006374:Helminthiasis, Animal; D012140:Respiratory Tract Diseases / Q000662:veterinary