1921
Volume 93, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645

Abstract

Abstract.

Seasonal changes play roles in the transmission success of fish-borne zoonotic trematodes (FZT). This study examined the seasonal transmission patterns of sensu lato (s.l.) and a virgulate cercaria (family Lecithodendriidae) in the snail intermediate host, in northeast Thailand. Snail samples were collected monthly during the rainy, cool, and hot seasons during 2012–2013 to determine the prevalence and intensity of larval trematode infections. The prevalence of s.l. varied significantly with season, being 0.31%, 1.05%, and 0.37% in the rainy, cool, and hot seasons, respectively ( < 0.05). Similarly, the prevalence of virgulate cercariae was 3.11%, 6.80%, and 1.64% in the rainy, cool, and hot seasons, respectively ( < 0.05). The intensity of larval trematode infections also varied between seasons and peaked in the hot season ( < 0.05) in both species. The snails infected with s.l. were significantly smaller ( < 0.05) and those infected with virgulate cercariae were significantly larger ( < 0.05) than uninfected snails. Seasonal variation and the different sizes of parasitized by s.l. and virgulate trematodes indicate complex host–parasite interactions with important implications for the epidemiology of s.l.

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  • Received : 14 Oct 2014
  • Accepted : 18 Mar 2015
  • Published online : 08 Jul 2015

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