报道的嗜内脏型疾病的发生率因不同地点而异。
The rate of reported viscerotropic disease varies in different settings.
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。
All cases of viscerotropic disease to date have been reported in primary vaccinees, starting 2–5 days after vaccination.
有必要更好地评估危险，预测危险较高的个体，并预测在接种后嗜内脏型和嗜神经型这两种严重并发症的易发因素。
There needs to be a better estimate of the risk, and prediction of subjects at risk and of factors predisposing to risk of both types of serious complication of the yellow fever vaccine.
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