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作者在兰开夏、伦敦和英格兰南部及东南部地区收集了919份6个月～88岁人群的血清标本,测定1、2及3型脊髓灰质炎病毒中和抗体。在25岁以下的人群中,具有三个型抗体(完全保护)的百分数曲线和具有至少一个型
The authors collected 919 serum samples from 6 months to 88 years of age in Lancashire, London and southern and south-eastern England and determined the type 1 and type 2 poliovirus neutralizing antibodies. Among people under the age of 25, the percentage curves with three types of antibodies (complete protection) and those with at least one type