1968-1969年甲型香港株流感开始流行期间,1890年前出生的人死亡率异常低。Hous-worth和Spoon已证实:这次流行超额死亡率开始发生于45岁,45—65岁的人流感流行所见到的超额死亡率大致相符。然而,和195D年代末期与1960年代初期亚洲甲型流感流行相反,从65岁开始,随着年令增大,超额死亡率就下降。至今未有资料说明为什么1968-1969 During the period 1968-1969 when the influenza A flu epidemic began, the death rate of people born before 1890 was unusually low. Hous-worth and Spoon have confirmed that the prevalence of excess mortality has started to coincide with the excess mortality seen in the 45-year-old human influenza at the age of 45. However, contrary to the pandemic of the pandemic influenza A in Asia in the late 1950s and early 1960s, as age 65 increased, excess mortality declined. So far there is no information on why 1968-1969