Not following hygienic principles like drinking contaminated water, eating vegetables and fruits without cleaning and not cutting nails of hands causes intestinal worms known as intestinal parasites. They are of many types but familiar ones are threadworm, pinworm, round worms and tape worms and these are observed in faces. They make their place in small intestines and caecum, use to come back in stomach from small intestines and excrete while vomiting. In females these parasites often travel form anus to vagina where they cause vaginal diseases also.
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