Trichuriosis (whipworm)
These worms are common in poor communities in warm, humid, climates. Whipworms embed themselves in the lining of the intestine causing significant blood and protein loss. They mature in 3 months growing up to 5 cm. Their eggs are released into the stool and mature in the soil.
Symptoms are uncommon. Heavy infestation leads to diarrhea with blood and mucus. Stool analysis will show this infection.

Link

CDC http://www.dpd.cdc.gov/dpdx/HTML/Trichuriasis.htm