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The present situation of paragonimiasis in endemic area in Phitsanulok Province.

A cross-sectional survey and evaluation of paragonimiasis situation from endemic area in Phitsanulok Province was studied. Studies on the species and prevalence of parasites which infected people in Noen Maprang, Phitsanulok Province were also conducted during October 1999-March 2000. The sputum specimens were collected and examined to identify Paragonimus heterotremus eggs. In addition fecal samples were collected and examined for parasites by the formalin-ethyl acetate concentration technique. P. heterotremus eggs were detected in 2 out of 391 sputum specimens; a prevalence of 0.51%. A total of 584 stool specimens were obtained and examined. It was found that the prevalence of parasitic infection was 36.30%. Opisthorchis viverrini infection was the most prevalent (10.78%), followed by Strongyloides stercoralis (9.59%), hookworm (8.22%), Echinostoma spp (2.23%), minute intestinal flukes (1.54%), Taenia species (1.37%), Enterobius vermicularis (0.68%), Entamoeba coli (1.03%) and Giardia lamblia (0.86%). The prevalent rate of paragonimiasis in this endemic area in Phitsanulok Province has decreased during the past decade. However, there were other important parasite infections, especially opisthorchiasis and strongylodiasis and these should be studied further.