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Presence of three distinct genotypes within the Paragonimus westermani complex in northeastern India

Published online by Cambridge University Press:  24 August 2012

K. REKHA DEVI
Affiliation:
Department of Environmental Health Sciences, Kochi Medical School, Oko, Nankoku City, Kochi 783-8505, Japan Regional Medical Research Centre, N.E. Region (Indian Council of Medical Research), Post Box #105, Dibrugarh 786 001, Assam, India
KANWAR NARAIN
Affiliation:
Regional Medical Research Centre, N.E. Region (Indian Council of Medical Research), Post Box #105, Dibrugarh 786 001, Assam, India
JAGADISH MAHANTA
Affiliation:
Regional Medical Research Centre, N.E. Region (Indian Council of Medical Research), Post Box #105, Dibrugarh 786 001, Assam, India
TULIKA NIRMOLIA
Affiliation:
Regional Medical Research Centre, N.E. Region (Indian Council of Medical Research), Post Box #105, Dibrugarh 786 001, Assam, India
DAVID BLAIR
Affiliation:
School of Marine and Tropical Biology, James Cook University, Townsville, Queensland 4811, Australia
SIDHARTHA P. SAIKIA
Affiliation:
Regional Medical Research Centre, N.E. Region (Indian Council of Medical Research), Post Box #105, Dibrugarh 786 001, Assam, India
TAKESHI AGATSUMA*
Affiliation:
Department of Environmental Health Sciences, Kochi Medical School, Oko, Nankoku City, Kochi 783-8505, Japan
*
*Corresponding author: Department of Environmental Health Sciences, Kochi Medical School, Oko, Nankoku City, Kochi 783-8505, Japan. Fax: +81 88 880 2535. E-mail: agatsuma@kochi-u.ac.jp

Summary

The name Paragonimus westermani (Kerbert, 1878) is commonly applied to members of a species complex that includes the well-known Asian lung fluke of medical and veterinary importance. Unambiguous molecular and morphological evidence showing the presence of a member of the complex in India has recently been published. In the present study we report the occurrence of 2 more members of the P. westermani complex in northeastern (NE) India. Surveys of the freshwater crabs Maydelliatelphusa lugubris in NE India revealed 2 morphologically distinct types of lung fluke metacercariae. Phylogenetic analyses, using DNA sequences from ITS2, 28S and cox1 gene regions indicate that these lung metacercariae belong to P. westermani complex. Type 1 metacercariae have a more basal position within the complex whereas type 2 metacercariae are closely related to the relatively derived forms of P. westermani from NE Asia (Japan, Korea, China) and Vietnam. A third type of metacercaria (type 3), detected in another crab host, Sartoriana spinigera in Assam, was phylogenetically close to P. siamensis, also a member of the P. westermani group. Molecular evidence has demonstrated the existence of 3 genotypes of lung flukes within the Paragonimus westermani complex in NE India. Two of these were previously unknown.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2012

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