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Introduction: Common  Intestinal infection caused by adult nematode Ascaris lumbricoides (Roundworm) Occurrence/Distribution: ·   Cosmopolitan (worldwide), More prevalent in Nepal, India China, Korea, Philippines and South Pacific Islands. ·  It is very common in Nepal, especially in those persons with poor hygienic habits. ·   Children are more susceptible to ascariasis because they play in the contaminated soil and likely to have it without washing their hands. ·  It is the most common worm in Hostel students and children. ·   1/6th of the total population is estimated to be infected with Ascariasis. Causative organism: ·  Ascaris lumbricoides, show sexual dimorphism. ·  Male size: up to 20 cm (length), 2-4 mm (diameter), curved tail, shorter. ·  Female size: 20-40 cm (length), 4-6 mm (diameter), straight tail, longer. ·   Helminth parasite Ascaris lumbricoides that lives in the jejunum of the small intestine. ·  After copul...

  · Intestinal endoparasite of man in the small intestine (especially in the jejunum) and some other vertebrates like pigs, cattle, etc, more prevalent in children than in adults as they are more susceptible to infection. · Body is cylindrical, unsegmented, elongated with tapering ends, anterior end is more slender than the posterior end. · Distinct sexual dimorphism i.e. sexes are separate. · Sanguivorous (Bloodsucking) · The worm is ammonotelic and ureotelic. Male size- up to 20 cm (length), 2-4 mm (diameter), smaller, curved tail, a pair of penial setae Female size - 20-40 cm (length), 4-6 mm (diameter), longer, straight tail, anus and gonopore · In males, Fifty pairs of pre-anal papillae are present in front of the cloaca and Five pairs of post-anal papillae behind the cloaca · Mouth is bounded by three broad lips (triradiate). One dorsal and two ventral-laterals. The dorsal lip bears two double papillae, one on each side. Each latero-ventral lip bears one double papilla and ...