SSPE due to wildvirus has been reported in persons who have been immunized with measles vaccine and have no history of symptomatic natural measles infection.
在接受麻疹免疫接种者和无天然麻疹感染史者中,野病毒引起的SSPE病例一直有报告。
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Laboratory stocks must be contained and safe management of the wildvirus in inactivated polio vaccine (IPV) manufacturing sites must be assured before the world can be certified polio-free.