Objective In order to understand the vaccination reaction of new type DPT.

目的了解无细胞百白破混合制剂（新DPT）的接种反应情况。

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In fact, it is in some ways worse than vaccination, since at least a vaccinated individual is also protected (albeit at the small risk of an adverse reaction to the vaccine).

ECONOMIST: A new way of thwarting viral epidemics on computers