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1977年10月至1978年2月在亚洲、欧洲及美国等地曾有报道甲型流感 H_1N_1亚型参与的流感暴发。该型病毒参与的疾病临床表现均较轻。中小学、大学及部队内年龄小于21岁的年青人发病率较高,但在整个人口中一般为低度到中等度。在同一时期内甲/维多利亚/3/75(H_3N_2)和甲/得克萨斯/1/77(H_3N_2)两型病毒株也有报告,但在1978年2月份以前,甲/得克萨斯/1/77(H_3N_2)占优势。
From October 1977 to February 1978, influenza outbreaks involving Influenza A H1N1 subtype were reported in Asia, Europe and the United States. The type of virus involved in the clinical manifestations of disease are lighter. The incidence of young people under the age of 21 in primary, primary, university and military units is higher but generally low to moderate throughout the population. A / V / 3/75 (H_3N_2) and A / Texas / 1/77 (H_3N_2) were also reported during the same period but prior to February 1978, A / Texas / 1/77 (H_3N_2) Dominant.