Paller V G V, Macaraig J R M, Verona R T, Estaño L A
Parasitology Research Laboratory, Animal Biology Division, Institute of Biological Sciences,College of Arts and Sciences, University of the Philippines Los Baños, College, Laguna Philippines.
Division of Natural Sciences and Mathematics, University of the Philippines Visayas, Tacloban College, Tacloban, Leyte Philippines.
Helminthologia. 2019 Mar 6;56(1):81-86. doi: 10.2478/helm-2018-0040. eCollection 2019 Mar.
Freshwater snails serve as one of trematodes' intermediate hosts. Previous studies on trematode larval stages in the Philippines have largely focused on species with public health importance. This study sought to investigate the prevalence of cercarial morphotypes in several freshwater snail species found in different habitat types (rice field, irrigation canals, and residential area) in selected agricultural areas in Los Baños and Bay in Laguna. Cercarial emergence was induced through exposure to artificial light. A total of 2,720 freshwater snails were collected and were represented by seven species, namely, Muller 1774 (n = 1229), von Moellendorf (n = 630), Lamarck, 1816 (n = 417), Lamarck 1819 (n = 257), Nevill (n = 18), sp. (n = 104), Muller 1774 (n = 65). A 2.57 % over-all prevalence was recorded; the infected snail species were (2.21 %), (0.21 %), (0.11 %). Four cercarial morphotypes, namely, Parapleurolophocercous cercaria (1.80 %), Virgulate xiphidiocercaria (0.26 %), Megaluruous cercaria (0.29 %), and Echinostome cercaria (0.22 %) were recovered from the infected snail species. Prevalence of cercarial infection was significantly different (p < 0.05) among habitat types.
淡水螺是吸虫的中间宿主之一。此前在菲律宾对吸虫幼虫阶段的研究主要集中在具有公共卫生重要性的物种上。本研究旨在调查在拉古纳省洛斯巴尼奥斯和贝伊选定农业地区不同栖息地类型（稻田、灌溉渠道和居民区）中发现的几种淡水螺物种中尾蚴形态类型的流行情况。通过暴露于人工光照诱导尾蚴逸出。共收集了2720只淡水螺，分属7个物种，即，穆勒1774（n = 1229）、冯·莫伦多夫（n = 630）、拉马克1816（n = 417）、拉马克1819（n = 257）、内维尔（n = 18）、物种（n = 104）、穆勒1774（n = 65）。记录到总体流行率为2.57%；受感染的螺类物种有（2.21%）、（0.21%）、（0.11%）。从受感染的螺类物种中发现了四种尾蚴形态类型，即副侧叶尾蚴（1.80%）、剑状尾蚴（0.26%）、巨尾蚴（0.29%）和棘口尾蚴（0.22%）。不同栖息地类型中尾蚴感染的流行率存在显著差异（p < 0.05）。
