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小童病「百日咳」個案增加成為全球趨勢

小童病「百日咳」個案增加成為全球趨勢
但係好多患病嘅小童都係未夠打防疫針嘅年齡
所以更容易中招

 

By JosieLo  (pupil) on 2011-08-30  Answers 1   Views 130

i can answer

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By wing cheng (graduate) on 2011-08-30

不過就算幼兒接種左疫苗,效用一般都維持唔到去青春期啦

 

 

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