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【《美国医学协会杂志》1991年11月】在1990～1991年的流感流行季节期间,全球大部分地区的发生率均较低。根据所有国家的报告,均为地区性流行,只有巴西和巴布亚新几内亚流行较重.亚洲在4～8月份,香港、日本、新加坡和泰国散在分离到流感病毒B;中国华南地区、印度和新加坡分离到流感病毒 A(H3N2);中国、香港、日本、新加坡和台湾则分离到流感病毒 A(N1H1).欧洲在4～5月份,流感活动减弱,有10个国家散在分离到流感病毒 B、A(H3N2)和 A(H1N1).北美加拿大报告在4～7月份持续散在分离到流感病毒 A 和流感病毒 B,前者大多为亚型 A(H3N2)。美国在2月后期流感病毒 A(H3N2)流行增加。
Journal of the American Medical Association November 1991 During the flu season of 1990-1991, the incidence was low in most parts of the world. According to reports from all countries, they are endemic, with only Brazil and Papua New Guinea being more prevalent. In Asia, influenza virus B was sporadically scattered between April and August in Hong Kong, Japan, Singapore and Thailand; in southern China, India and Singapore Influenza A (H3N2) was isolated and influenza A (N1H1) was isolated in China, Hong Kong, Japan, Singapore and Taiwan. Influenza activity was attenuated in Europe from April to May, with 10 countries scattered isolates of influenza virus B, A (H3N2) and A (H1N1). North America Canada reported the continuous isolation of influenza A and B from April to July, most of which were subtype A (H3N2). The United States in late February influenza virus A (H3N2) epidemic increased.