Bilharziasis Control In Egypt -- The Egyptian Government, with the collaboration of the World Health Organization (WHO), is working to control bilharziasis, a disease that is responsible for one out of every five deaths in the country. (Bilharzasis is caused by a larva born in snails in the stagnant waters of the Nile, which penetrates into the human tissues and develops into worms, causing general bodily and mental deterioration). Efforts are being made in experimental controls on a special tract of land within the health demonstration area in Calioub Province, approximately 20 miles north of Cairo, where the carrier snails will be destroyed and sanitary measures introduced to provide good water and proper disposal of sewage. April 12, 1954. (Photo by United Nations).