Recent evidence from the United States also suggests a higher risk of neurotropic disease in older vaccinees.
来自美国的近期证据也表明，年龄较大的接种者发生嗜神经型疾病的危险较大。
2
All cases of viscerotropic disease to date have been reported in primary vaccinees, starting 2–5 days after vaccination.
迄今为止所有的嗜内脏型病例都发生于初次接种者，在接种后2-5天内发病。
3
Current data are insufficient to define the incidence of adverse events in primary vaccinees as opposed to individuals re-vaccinated after a long interval.