title: Persistence in nature of influenza virus A/eq/Praha/56 (Heq1Neq1).
abstract: Equine influenza occurred in Czechoslovakia 14 years after the last epizootic in horses that had returned from abroad. Six strains A (Heq1Neq1) antigenically related to, but not identical with, strain A/eq/Praha/56 were isolated from 10 washings. Seroconversion was demonstrated with paired sera, but the antibody increase was more marked against the newly isolated strain.
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000096:biosynthesis; D000956:Antigens, Viral / Q000032:analysis; D001769:Blood / Q000382:microbiology; D003289:Convalescence; D003604:Czechoslovakia; D006385:Hemagglutination Inhibition Tests; D006734:Horse Diseases / Q000276:immunology / Q000382:microbiology*; D006736:Horses; D005779:Immunodiffusion; D009980:Influenza A virus / Q000276:immunology / Q000302:isolation & purification*; D009439:Neuraminidase / Q000276:immunology; D009976:Orthomyxoviridae Infections / Q000276:immunology / Q000382:microbiology / Q000662:veterinary*
chemical_list: D000914:Antibodies, Viral; D000956:Antigens, Viral; D009439:Neuraminidase