In this article we will discuss about the external morphology of roundworm or Ascaris. Ascaris resembles an ordinary earthworm and is the largest intestinal nematode parasitising man. It is milk-white in colour but presents a reddish-yellow shade. Body is elongated, cylindrical, and gradually tapering at both ends. The females are usually 20-25 cm in length and 5 mm in diameter [...]
In this article we will discuss about the life cycle of Ascaris suum in pigs. Eggs in faeces: It has been shown that the female of A. suum may lay as many as 2,00,000 eggs per day. The eggs are laid in the host’s (pig) intestine which are deposited outside along with faeces of host. Development in soil: A Rhabditiform [...]
Transmission of E. histolytica from man to man occurs through its encysted stage and infection is effected through the ingestion of these cysts in food or drinks. It is to be noted that mature quadrinucleate cysts are the infective forms of this parasite. The contamination of food and drinks is occurred by: i. Faecal contamination of drinking water, vegetables and [...]