title: Clinical and epidemiological features of an outbreak of influenza in Ulan Bator in 1971.
abstract: In October and November 1971 an outbreak of influenza (type A virus) occurred in the town of Ulan Bator. A clinical and epidemiological investigation showed that some 30% of the population presented typical signs of influenza of medium severity. The etiology of the outbreak was confirmed by virological, serological, and fluorescent-antibody techniques. A detailed study of the antigenic structure of the virus isolated in the Mongolian People's Republic, A/Mongolia/013/71, showed that it belonged to a new antigenic variety of the Hong Kong strain, A/Hong Kong/107/71 (H3N2).
mesh_terms: D000914:Antibodies, Viral / Q000032:analysis; D005455:Fluorescent Antibody Technique; D006385:Hemagglutination Inhibition Tests; D006389:Hemagglutinins, Viral / Q000032:analysis; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology* / Q000276:immunology / Q000382:microbiology; D008986:Mongolia; D009975:Orthomyxoviridae / Q000276:immunology
chemical_list: D000914:Antibodies, Viral; D006389:Hemagglutinins, Viral