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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的确，1999年对杰克逊的百年头发样本测试显示两种金属含量严重超标，确实能导致严重的健康隐患。

Indeed, a 1999 evaluation of Jackson's century-old hair samples revealed significantly elevated levels of both metals, which surely contributed to his severe health decline.

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产生了两种截然不同理论来解释这一发现。

This discovery led to two opposing theories as to why.

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