Haesebrouck F, Pensaert M
Faculty of Veterinary Medicine, University of Ghent, Belgium.
Comp Immunol Microbiol Infect Dis. 1988;11(3-4):215-22. doi: 10.1016/0147-9571(88)90040-9.
From 1984 until 1986, influenza isolates were obtained from 59 outbreaks of respiratory tract disease in Belgium. In 21 of the outbreaks, H3N2-influenza virus isolates, related to the human A/Port Chalmers/1/73 strain were obtained. All other isolates were H1N1-influenza virus strains. The prevalence of variants of the human H3N2-influenza virus in the Belgium swine population was determined by examining sow sera which had been collected between 1969 and 1984. The results of this serological study showed that, although a Port Chalmers-like strain was associated with outbreaks of respiratory tract disease in swine only since 1984, such strain was already present in the swine population in 1974, when a low percentage of sow sera (7%) reacted with A/Port Chalmers/1/73. Between 1975 and 1984, antibody against this strain were present in 28-61% of the sera. Furthermore, 3-6% of the sera collected between 1971 and 1980 reacted with the A/Hong Kong/1/68 strain. There were no indications that more recent human H3N2-strains (A/Texas/1/77, A/Bangkok/1/79 and A/Belgium/2/81) circulated in the Belgian swine population.
1984年至1986年期间，从比利时59起呼吸道疾病暴发中分离出流感病毒。在其中21起暴发中，分离出了与人类A/查尔默斯港/1/73毒株相关的H3N2流感病毒。所有其他分离株均为H1N1流感病毒株。通过检测1969年至1984年间收集的母猪血清，确定了人类H3N2流感病毒变体在比利时猪群中的流行情况。这项血清学研究结果表明，尽管类似查尔默斯港的毒株自1984年起才与猪的呼吸道疾病暴发有关，但该毒株在1974年就已存在于猪群中，当时只有低比例（7%）的母猪血清与A/查尔默斯港/1/73发生反应。1975年至1984年间，28%至61%的血清中存在针对该毒株的抗体。此外，1971年至1980年间收集的血清中有3%至6%与A/香港/1/68毒株发生反应。没有迹象表明最近的人类H3N2毒株（A/得克萨斯/1/77、A/曼谷/1/79和A/比利时/2/81）在比利时猪群中传播。
