Poisons and pathogenic micro-organisms are among the natural health hazards with which human beings are obliged to co-exist. 毒药和致病微生物是人类不得不与之共存的天然健康危害。
May be associated with proctitis and a variety of pathogenic microorganisms on the invasion of the intestinal tract. 可能与直肠炎及多种病原微生物对肠道的侵袭有关。
