Persistence of virus in respiratory infections of chickens.
D000818:Animals; D001991:Bronchitis / Q000382:microbiology / Q000662:veterinary; D002353:Carrier State; D002645:Chickens; D006564:Herpesviridae / Q000302:isolation & purification; D006566:Herpesviridae Infections / Q000382:microbiology / Q000662:veterinary; D007827:Laryngitis / Q000382:microbiology / Q000662:veterinary; D009521:Newcastle Disease / Q000382:microbiology; D009522:Newcastle disease virus / Q000302:isolation & purification; D011201:Poultry Diseases / Q000382:microbiology*; D012328:RNA Viruses / Q000302:isolation & purification; D012141:Respiratory Tract Infections / Q000382:microbiology / Q000662:veterinary*; D014136:Tracheitis / Q000382:microbiology / Q000662:veterinary; D014777:Virus Diseases / Q000382:microbiology / Q000662:veterinary