STUDY OF LUNG FLUKES FROM PHILIPPINES——A PRELIMINARY REPORT

In this paper taxonomic study on paragonimus including their metacercariae obtainedfrom the crabs collected from Sorsogon, Luzon, Phi1ippines and adult worms and ova obtain-ed through animal feeding, with light microscopy and scanning electron microscopy revealedthat there may exist two or more species of lung flukes in Philippines.The occurrence ofSemisulcospira libertina in addition to Antemelania dactylus (Lea) as an additional snailhost is mentioned for the first time. The chromosome Karyotyping of the adult worms revealed that they belong to thediploid pattern. Electronic scanning showed that the cuticular spines of the Paragonimus from Sorsogonlook like "pineapple ears" both in distribution and In appearance, a new finding that has not been recorded before. In the lungs of a white rat killed 290 days after infection, two adult worms wereobtained within the solitary eyst. These 2 adult worms measured 4.5×2.5mm and 4.5×3.0 mm respectively. Their unusually small size and somewhat round shape suggest that theymay be of a different species from those hitherto reported in the Philippines. Clearcut evidence is presented for the first time, demonstrating the occurrence of the phemomenon of cross fertilization (allogamy) of lung flukes.     

菲律宾并殖吸虫的初步研究

本文是根据由菲律宾吕宋岛上索尔索贡(Sorsogon)采集的淡水蟹体内分离到的并殖吸虫囊蚴,和用它喂动物后获得的并殖吸虫成虫和虫卵所进行的分类学研究,经光学显微镜和扫描电子显微镜观察,显示在菲律宾可能存在着两种或更多种的并殖吸虫,本文并首次指出放逸短沟蜷可能是除Antemelania dactylus Lea螺以外的另一种第一中间宿主。 成虫的染色体核型研究证明它属于二倍体型,扫描电子显微镜检查发现,并殖吸虫皮棘的外形和分布与菠萝的刺相似,迄今均未见有类似的报道。 在一只感染后290天处死的大白鼠单个肺囊内获得了两条成虫,其大小分别为4.5×2.5毫米和4.5×3.0毫米。由于它们个体特别小,而且略呈圆形,故它们可能不同于菲律宾已报告过的并殖吸虫。同时,我们还首次观察到并殖吸虫间的交叉受精现象。