Demidova S A, Krylov V F, Bolnokina S I, Gadashevich V N, Poliakova T G
Vopr Virusol. 1979 Jan-Feb(1):34-7.
Virological and serological studies of an epidemic influenza outbreak in December, 1977, carried out in the clinical department of D. I. Ivanovsky Institute of Virology of the USSR AMS established the disease to have been caused by influenza Al viruses. The marked incidence of the disease among younger age groups was due to a low humoral immunity level to the strains which had circulated before the young people's birth. The reduced effectiveness of protection by antibody against viruses which had caused influenza disease 20--30 years ago was conducive to the spread of influenza Al cases among middle-aged and senile population.
1977年12月，苏联医学科学院D. I. 伊万诺夫斯基病毒学研究所临床科室对一场流行性感冒爆发进行了病毒学和血清学研究，确定该疾病由甲型流感病毒引起。该疾病在较年轻年龄组中的显著发病率是由于年轻人出生之前流行的毒株的体液免疫水平较低。针对20至30年前引起流感疾病的病毒的抗体保护效果降低，有利于甲型流感病例在中年和老年人群中传播。
