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１９９３～１９９４年流感流行期在保定地区共采集流感样病人咽拭子标本５０份，分离出１９株流感病毒．其中乙型１４株，甲３型５株，经抗原性分析表明乙型株为新变种，甲３型流行株变异不明显。流行前后健康人群抗体水平的测定结果显示，乙型新变种已广泛传播，再引起流行的可能性较小；１９９４～１９９５年流行期中很可能出现甲３型新变种，应加强监测。
From 1993 to 1994, a total of 50 samples of throat swabs from influenza-like patients were collected during the influenza epidemic period in Baoding area, and 19 influenza viruses were isolated. There were 14 strains of type B and 5 strains of type A and 3 strains. The result of antigenicity analysis showed that type B was a new variant, but the variant of type A 3 was not obvious. Prevalence of antibody levels in healthy population before and after the test results show that new varieties of B have been widely spread, and then the possibility of causing the epidemic smaller; 1994 ~ 1995 during the epidemic is likely to A new variant 3, should be strengthened monitoring.