Rojekittikhun W, Pubampen S, Waikagul J
Department of Helminthology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.
Southeast Asian J Trop Med Public Health. 1998 Mar;29(1):148-53.
The viscera of swamp eels were obtained from a local market in Bangkok twice a month from June 1996 to May 1997. The livers were separated, weighed and counted. Gnathostome larvae were recovered from the livers by the digestion technic, examined, identified, and counted. A total of 12,278 Gnathostoma larvae were obtained from 18,561.1 g (15,264 pieces) of eel livers. The overall average number of larvae/g liver and the overall average number of larvae/liver are 0.91 and 0.94, respectively. The greatest number of larvae/g liver (on average) was in December (high levels of infection during the months of October to December) whereas the lowest was in April (lowest levels of infection during the months of March to April). Thus there was a marked decrease in the average number of larvae/g liver during January to April, which then started to rise in May. This finding suggests that the level of infection abruptly decreases soon after the completion of the rainy season, starts to rise when the rain has come, and reaches its peak when the amount of rainfall is highest. More than 99% of the total gnathostome larvae recovered were identified to be G. spinigerum, and 25.4% of the entire larvae recovered bore variant or abnormal cephalic hooklets. The most common unusual feature was that there were extra rudimentary hooklets above row one, below row four and in between the four rows of hooklets which comprised 21.4%. In addition, the body size and the number of cephalic hooklets of G. spinigerum are also discussed.
1996年6月至1997年5月，每月两次从曼谷当地市场获取黄鳝的内脏。分离肝脏，称重并计数。采用消化技术从肝脏中回收颚口线虫幼虫，进行检查、鉴定和计数。从18561.1克（15264条）鳝鱼肝脏中总共获得12278条颚口线虫幼虫。每克肝脏幼虫的总体平均数和每只肝脏幼虫的总体平均数分别为0.91和0.94。每克肝脏幼虫数量最多（平均）的是12月（10月至12月感染水平较高），而最低的是4月（3月至4月感染水平最低）。因此，1月至4月每克肝脏幼虫的平均数显著下降，5月开始上升。这一发现表明，雨季结束后感染水平迅速下降，降雨开始时开始上升，降雨量最高时达到峰值。回收的全部颚口线虫幼虫中，超过99%被鉴定为棘颚口线虫，回收的全部幼虫中有25.4%的头部小钩有变异或异常。最常见的异常特征是在第一排上方、第四排下方以及四排小钩之间有额外的雏形小钩，占21.4%。此外，还讨论了棘颚口线虫的体型和头部小钩数量。
