title: Biological variation within Opisthorchis viverrini sensu lato in Thailand and Lao PDR.
abstract: Previous molecular genetic analyses indicate that Opisthorchis viverrini is a complex of at least 2 cryptic species in Thailand and the Lao People's Democratic Republic (PDR). Opisthorchis viverrini sensu lato (s.l.) populations can be divided into 6 genetic groups, which correlate with 5 different river wetlands systems. The present study examines the infectivity, growth, fecundity, and body size of O. viverrini s.l. isolates from these systems. Worm recovery was lowest in the Songkhram River, which differed significantly from all other wetland systems. In addition, the Chi River and Nam Ngum River populations also differed significantly. A similar pattern was found for fecundity. These results support the genetic/molecular data indicating a subdivision of O. viverrini populations on the basis of watershed and that propose the existence of cryptic species in Thailand and the Lao PDR.
authors: Department of Biochemistry, Faculty of Medicine, Khon Kaen University, Liver Fluke and Cholangiocarcinoma Research Center, Khon Kaen 40002, Thailand.
authors: Nonglak
authors: N
authors: Laoprom
authors: Weerachai
authors: W
authors: Saijuntha
authors: Paiboon
authors: P
authors: Sithithaworn
authors: Sopit
authors: S
authors: Wongkham
authors: Thewarach
authors: T
authors: Laha
authors: Katsuhiko
authors: K
authors: Ando
authors: Ross H
authors: RH
authors: Andrews
authors: Trevor N
authors: TN
authors: Petney
mesh_terms: D000818:Animals; D044822:Biodiversity; D049628:Body Size; D006224:Cricetinae; D003530:Cyprinidae / Q000469:parasitology*; D005243:Feces / Q000469:parasitology; D005298:Fertility; D005393:Fish Diseases / Q000469:parasitology*; D014644:Genetic Variation; D007812:Laos; D008297:Male; D008647:Mesocricetus; D009889:Opisthorchiasis / Q000469:parasitology / Q000662:veterinary*; D009891:Opisthorchis / Q000033:anatomy & histology / Q000145:classification* / Q000502:physiology; D010270:Parasite Egg Count / Q000662:veterinary; D045483:Rivers; D013785:Thailand; D053833:Wetlands