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KMID : 0311219730040010065
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Yonsei Reports on Tropical Medicine
1973 Volume.4 No. 1 p.65 ~ p.75
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Epidemiological investigation of Paragonimus Infection in Laos
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Soh Chin-Thack
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Abstract
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An epidemiological study on Paragonimus infection was carried out in Laos during the Period 10 January to 19 February, 1973. The results obtained are summarized as follows:
1. From 1968 to 1972, a total of 151 cases with sputum positive for Paragonimus eggs were noted in the laboratory records of the five medical institutions visited.
2. Intradermal test using Paragonimus westermani antigen were carried out on sample groups in Pakse, Savannakhet, Vientiane, Ban Xon, Sanakham, Luang Prabang and Houei Sai. Among the total of 1531 tested, 151 (9.8%) were positive reactors.
3. A larger number of positive dermal reactors was found distributed among adult age groups (25 years and over) than in younger age groups.
4. The seven provinces where over 50 people were tested in order of decreasing percentages of positive dermal reactors were Savannakhet, Saravane, Xieng Khouang, Vientiane, Luang Prabang, Houakhong and Sedone. Several provinces were excluded from the list because the numbers examined were not sufficient to perm-it an evaluation.
5. A total of 22 active cases were found and interviewed. The information obtained led to 15 places being designated as endemic foci. They were situated in the following provinces: Savann akhet, Vientiane, Xieng Khouang, Phong Sali, Sedone, Luang Prabang and Houa Phanh.
6. The four following species of family Thiaridae snails considered as probable first intermediate hosts were collected from the areas visited: Melanoides housei (Lea), Tarebia granifera (Lamarck), Brotia sp., Thiara scabra(O.F. Mueller). But their host capacity remains to be verified.
7. Crabs were collected from each area. No metacercaria of Paragonimus westermani were found in any of the 754 collected samples which included Potamon smithianus, Parathelphusa dugasti and Parathelphusa sp.
8. The consumption of crabs raw was a nation wide traditional food habit in Laos, and was recognized as one of the factors in the spread of paragonimiasis.
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