Posts Tagged ‘J&J’

Night 2: Trichuriasis

December 13th, 2009

Trichuriasis is one of three soil-transmitted helminths, or worm infections.  Of all the NTDs on which we focus, it is the second most prevalent, infecting over 600 million people worldwide.  More commonly known as whipworm, trichriasis thrives in warm, humid climates and flourishes in communities with poor access water and sanitation.

Trichuriasis is transmitted through accidental ingestion of contaminated soil or unwashed vegetables fertilized with human feces. Once inside the body, whipworm eggs migrate to the small intestine and hatch into adult worms which embed themselves in the lining of the large intestine and colon. Adult whipworms can live in the body for up to a year, and female worms can shed between 3,000 and 20,000 eggs per day. The eggs are passed out of the body via the stool of the human host; if inadequate sanitation exists, they will again be transmitted into the soil, beginning the cycle again.

Children are at high risk for whipworm, because they often play outside in the dirt or soil and put their hands in their mouths without washing them. Prolonged exposure to whipworm can cause serious health consequences including malnutrition, anemia, and physical growth retardation, particularly in children.

A study in Jamaica showed that children with heavy whipworm infections had lower reading and arithmetic scores and were also shorter than those without infection. Upon treatment, all these indicators improved.This study further demonstrates the importance of controlling and eliminating NTDs for increase children’s  school perfomance. » Read more: Night 2: Trichuriasis

Night 1: Ascariasis

December 12th, 2009

When we think of parasites, we often think of tiny–even microscopic–organisms.  But ascariasis, also known as roundworm, is not only the most common NTD but also the largest in size.  Ascaris lumbricoides worms can reach 5-14 inches in length, causing immense damage: intestinal obstruction, anemia, and impairment of child growth and development.

Having trouble visualizing what a host of 14-inch worms looks like?  Take this tiny girl from Paraguay, infected with a particularly heavy load of ascariasis:

soil transmitted helminth infections As you can see, her abdomen is grossly distended–the tell-tale sign of a major worm infection.  In many severe cases like hers, you can even physically palpate the worms on the outside of the abdomen.

But what’s even more shocking is to see the worms themselves.  These are the actual worms that were expelled from her body:

worms

When you see a worm burden of this magnitude, it’s not hard to understand why kids who have worm infections are stunted and malnourished and perform less well in school.

More about ascariasis:

» Read more: Night 1: Ascariasis