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Effects of roundworms to your body and where they frequently attack

GENERAL CHARACTERISTICS OF ROUNDWORMS

• They are un-segmented, elongated and 

cylindrical. 

• They have separate sexes with separate 

appearances. 

• They have a tough protective covering or 

cuticle. 

• They have a complete digestive tract with 

both oral and anal openings. 

• The nematodes are free living (majority) or 

parasites of humans, plants or animals.

ASCARIS LUMBRICOIDES

• This is a common roundworm infecting more than 700 million people worldwide.

Morphology:

• Male adult worm measures 15-20 cm in length. The posterior end is curved ventrally. The female worm measures 20-40 cm in length. Its posterior end is straight.

Infective stage and modes of infection:

• The egg containing larva when ingested with contaminated raw vegetables causes ascariasis.

Life cycle:

• Ingested eggs hatch in the duodenum. 

• The larvae penetrate the intestinal wall and circulate in the blood.

• From the heart they migrate to the lungs, ascend to the trachea, descend to the esophagus and finally reach the small intestine to become adult. 

• The female pass immature eggs which pass to the soil and mature in 2 weeks.

Pathogenecity and clinical features

• Adult worms in the intestine cause abdominal pain and may cause intestinal obstruction especially in children. 

• Larvae in the lungs may cause inflammation of the lungs (Loeffler’ssyndrome) pneumonia-like symptoms.

Diagnosis

•Examination of stool for eggs by direct saline smear method. The egg is ovoidal, 75x60 microns, covered by albuminous mamillatins.

Treatment

• Mebendazole, Albendazole and Piperazine drugs.

Content created and supplied by: Nathoo (via Opera News )

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