title: Regulatory aspects of velogenic viscerotropic Newcastle disease.
mesh_terms: D000818:Animals; D002140:California; D002645:Chickens; D004467:Economics; D004630:Emergencies; D006077:Government Agencies; D007886:Legislation, Veterinary; D009521:Newcastle Disease / Q000209:etiology / Q000517:prevention & control*; D009522:Newcastle disease virus / Q000276:immunology; D011790:Quarantine; D014611:Vaccination; D014887:Weather