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同义词： booster booster shot recall dose
以上来源于: WordNet
N a supplementary injection of a vaccine given to maintain the immunization provided by an earlier dose (保持药效的)激发剂
Children are given a first dose at 12 to 15 months and a second, booster dose, at between three and five years old.
BBC: NEWS | UK | England | South Yorkshire | Measles outbreak affects children
One option is a booster dose in adolescence.
BBC: Whooping cough makes a comeback
"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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