Many elements of the normal flora may act as opportunistic pathogens. 很多正常菌群都可能是條件致病。
Septicum is part of the normal gastrointestinal tract flora but when infection occurs, it is often fatal, especially in the diabetic population. 壞疽毒素是胃腸道的正常菌群，但一旦發(fā)生感染卻是致命的，特別是糖尿病患者。
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