The problem of Newcastle disease.
D000818:Animals; D006920:Hygiene; D008854:Microscopy, Electron; D009521:Newcastle Disease / Q000382:microbiology / Q000517:prevention & control*; D009522:Newcastle disease virus / Q000276:immunology / Q000302:isolation & purification; D011200:Poultry; D014611:Vaccination; D014765:Viral Vaccines / Q000008:administration & dosage
D014765:Viral Vaccines