Intestinal parasitoses among the workers and their families at three electricity generating dams in Thailand.

During September 17, 1980 - May 29, 1981 a total of 986 single stool specimens were collected from workers and their families at three electricity generating dams under the administration of the Electricity Generating Authority of Thailand (EGAT). Parasitological surveys were carried out at the dam sites, namely the Khoa Laem Project, the Srinakarin Dam and the Ubolratana Dam. The overall prevalence at all three sites are moderately high (62.50%, 45.33% and 54.05% respectively). The Khoa Laem project had the highest prevalence of E. histolytica infection (16.16%) which may be the result of poorer sanitary standards for workers of the project under construction. The occurrence of opisthorchiasis at the first two sites situated in central Thailand (12.19% and 7.01%) is the result of influx of migrant northeastern workers. The prevalence of other parasites are not remarkable. However, because of the proximity of the people living close to the large bodies of fresh water, urgent measures should be taken to eradicate the parasitic infections among them in order to prevent the spread through the water.

Freshwater snails survey in and around the Cambodian refugee camp, Sakaeo District, Prachinburi Province, Thailand.

The freshwater snails surveys were carried out during September 15, 1981 to December 15, 1981, especially for the intermediate or possible intermediate host of Schistosoma mekongi in and around the Cambodian refugee camp at Ban Kaeng Holding Centre, Sakaeo District, Prachinburi Province. A total of 30 localities were visited and 15 species of freshwater snails were collected. The snails did not shed any cercaria of S. mekongi and none of these was the intermediate host of S. mekongi.

A survey on intestinal parasitic infections in Laotian refugees at Ubon Province, Northeastern Thailand, with special reference to schistosomiasis.

454 stool specimens were collected from the Laotian refugees residing in the refugee camp, Ubon Province, from August 8 to 11, 1978, and were examined by formalin ether sedimentation technique. One of them (0.22%) was infected with Schistosoma mekongi. Since there are freshwater hydrobiid snails, Lithoglyphopsis aperta, the intermediate host of S. mekongi in that area, it is probable that the disease may become established in Northeastern Thailand in the future, which will eventually lead to health and economic problems in Thailand.