title: Studies on a test vaccine for equine influenza virus. II. Field trials.
mesh_terms: D000818:Animals; D007240:Equartevirus; D006734:Horse Diseases / Q000276:immunology; D006736:Horses; D009976:Orthomyxoviridae Infections / Q000276:immunology / Q000662:veterinary*; D012328:RNA Viruses; D014611:Vaccination / Q000662:veterinary*; D014765:Viral Vaccines
chemical_list: D014765:Viral Vaccines