dose timing
剂量时间
以上为机器翻译结果，长、整句建议使用 人工翻译 。
"It's going to be a few years until we really know whether or not people need another booster dose, and what is the optimal timing for that booster dose" for Tdap, because it is so new, Martin said.
CNN: Vaccination role unclear in whooping cough outbreak
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