Investigation on rickettsiae natural infection in mice and vector arthropods in partial areas of Yunnan
10.16462/j.cnki.zhjbkz.2019.02.015
- Author:
Hong-xiang YA
1
;
Jing-lin WANG
;
You-hong ZHONG
Author Information
1. Yunnan Institute of Endemic Diseases Control and Prevention, Yunnan Key Laboratory of Natural Focus Disease Control and Prevention, Dali 671000, China
- Publication Type:Research Article
- Keywords:
Rickettsiae;
Natural infection;
Gene sequence analysis;
Yunnan province
- From:
Chinese Journal of Disease Control & Prevention
2019;23(2):196-200
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate rickettsiae infection from host animals and vector arthropods in some areas of Yunnan Province. Methods Rat clip and cage traps were used to capture mice. Chiggers from body surface of mice and ticks from body surface of farm cattle were collected. DNAs were extracted from mice spleens, chiggers and ticks. Rickettsiae groEL segment were amplified by nested-polymerase chain reaction (nPCR), sequenced to analyze the homology with other known sequences. Results A total of 410 samples were collected for rickettsiae groEL segment detection with nPCR and 19 samples (4.63%) showed positive for rickettsiae groEL segment . Among them, 2.68%(11/410)were positive for Orientia tsutsugamsushi (Ot) groEL segment, and 1.22%(5/410)were positive for spotted fever group rickettsia (SFGR) groEL segment, and 0.49%(2/410)were positive for rickettsia mooseri (Rm) groEL segment, and 0.24%(1/410)were positive for rickettsia endosymbiont(Re) groEL segment. When analyzed the homology with other known sequences, 11Ot strains with 93.6%-100% similarities among them in this study shared the highest similarity with other Ot strains from GenBank respectively, reached up to 96.1%-100%; The groEL segments of 5 SFGR strains with 92.1%-99.5% similarities among them in this study shared highest similarity with other SFGR strains from other GenBank respectively, reached up to 98.9%-100%; In this study groEL segments of 2 Rm strains all showed 100% similarity with Wilmington strain (GenBank No:AE017197); One groEL segment of Re showed 98.9% similarity with Re strain (GenBank No:EU435143). Conclusion There were kinds of rickettsiaes infection in host animals and vector arthropods in Yunnan Province, so the monitoring and prevention of the Rickettsiosis should be strengthened.
