Cossart Y E
Br Med J. 1977 Jun 25;1(6077):1621-3. doi: 10.1136/bmj.1.6077.1621.
Genetic marker tests were performed on 997 strains of poliovirus isolated from patients with neurological disease and from healthy people in England and Wales. Before the introduction of live attenuated vaccine most strains could multiply at raised temperatures. Now, however, many strains isolated from cases of poliomyelitis or from healthy persons with no known contact with vaccine cannot grow above 37 degrees C, and in this respect resemble the vaccine strains. The three serotypes are also much more evenly represented. Hence probably to a limited extent the vaccine-like strains have established themselves in the community.
对从英格兰和威尔士患有神经系统疾病的患者以及健康人身上分离出的997株脊髓灰质炎病毒进行了基因标记测试。在减毒活疫苗引入之前,大多数毒株能在较高温度下繁殖。然而现在,许多从脊髓灰质炎病例或与疫苗无已知接触的健康人身上分离出的毒株在37摄氏度以上无法生长,在这方面它们与疫苗毒株相似。三种血清型的分布也更加均匀。因此,类似疫苗的毒株可能在一定程度上已在社区中立足。