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由于广泛和成功地实行了儿童期免疫接种计划,许多疫苗可预防的疾病已大为减少,但是,单靠成功的儿童期免疫接种未必能消除特殊的发病问题,目前发生的一些疫苗可预防的疾病和死亡中,青年和成人占很大的比例。未曾自然感染或未接种过白喉、破伤风、麻疹、腮腺炎和脊髓灰质炎疫苗或类毒素的人仍有发生上述疾病及并发症的危险。为进一步减少这些疫苗可预防的疾病的发生,应对这些青年和成人进行常规的免疫
Due to the widespread and successful introduction of childhood immunization programs, many vaccine-preventable diseases have been greatly reduced, but successful childhood immunization alone may not be able to eliminate the specific problem of the onset of some of the vaccine-preventable Among diseases and deaths, young people and adults account for a large proportion. Persons who have not been naturally infected or who have not been vaccinated against diphtheria, tetanus, measles, mumps and poliovirus or toxoid are at risk of developing the above-mentioned diseases and complications. To further reduce the incidence of these vaccine-preventable diseases, these young adults and adults should be routinely immunized