Pereira M S, Chakraverty P
J Hyg (Lond). 1982 Jun;88(3):501-12. doi: 10.1017/s0022172400070352.
The laboratory surveillance of influenza in the UK has continued to demonstrate the regularity of influenza outbreaks each winter even in the absence of increase in the other indices which reflect the morbidity and mortality associated with influenza. The period of five years from 1976 to 1981 has seen the appearance of a second sub-type of influenza. A with the return of the historic H1N1 virus; and the continued circulation of H3N2 concurrently with H1N1 virus. Variants of both these influenza A viruses have been demonstrated as well as further changes in the strains of influenza B virus isolated during this time.
英国的流感实验室监测持续表明,即便反映流感相关发病率和死亡率的其他指标没有上升,每年冬季流感爆发仍具有规律性。1976年至1981年这五年间出现了第二种流感亚型。甲型流感中,具有历史意义的H1N1病毒再次出现;同时H3N2与H1N1病毒共同持续传播。这两种甲型流感病毒的变种已得到证实,在此期间分离出的乙型流感病毒毒株也有进一步变化。