why aren't natives of high-risk countries affected in the same way?
Often their bodies have become accustomed to the bacteria and developed immunity to them.
traveler's diarrhea 旅行性腹泻 : why not risk factors affect local p
回家路 (2014-10-06 10:11:13) 评论 (0)why aren't natives of high-risk countries affected in the same way?
Often their bodies have become accustomed to the bacteria and developed immunity to them.