[Local immunity in virus infection of the digestive tract].
D000818:Animals; D000917:Antibody Formation / Q000502:physiology*; D002645:Chickens; D005767:Gastrointestinal Diseases / Q000276:immunology*; D006801:Humans; D009522:Newcastle disease virus / Q000276:immunology; D017955:Poliovirus / Q000276:immunology; D013950:Thymus Gland / Q000502:physiology; D014777:Virus Diseases / Q000276:immunology*