Molecular Epidemiology and Genetic Diversity of Orientia tsutsugamushi From Patients and Small Mammals in Xiangyun County, Yunnan Province, China

ABSTRACT Introduction Scrub typhus, also known as Tsutsugamushi disease (TD), is an acute febrile illness that poses a significant public health threat to nearly one billion people in the Asia‐Pacific region. The disease is caused by Orientia tsutsugamushi (OT) and is primarily transmitted through t...

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Main Authors: Li Chen, Yi‐Chen Kong, Jia‐Wei Tian, Pei‐Yu Han, Song Wu, Chen‐Jie He, Ti‐Lian Ren, Bo Wang, Lian Qin, Yun‐Zhi Zhang
Format: Article
Language:English
Published: Wiley 2025-09-01
Series:Veterinary Medicine and Science
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Online Access:https://doi.org/10.1002/vms3.70573
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author Li Chen
Yi‐Chen Kong
Jia‐Wei Tian
Pei‐Yu Han
Song Wu
Chen‐Jie He
Ti‐Lian Ren
Bo Wang
Lian Qin
Yun‐Zhi Zhang
author_facet Li Chen
Yi‐Chen Kong
Jia‐Wei Tian
Pei‐Yu Han
Song Wu
Chen‐Jie He
Ti‐Lian Ren
Bo Wang
Lian Qin
Yun‐Zhi Zhang
author_sort Li Chen
collection DOAJ
description ABSTRACT Introduction Scrub typhus, also known as Tsutsugamushi disease (TD), is an acute febrile illness that poses a significant public health threat to nearly one billion people in the Asia‐Pacific region. The disease is caused by Orientia tsutsugamushi (OT) and is primarily transmitted through the bite of chigger mite larvae. Due to its nonspecific clinical manifestations, early diagnosis is challenging, often leading to misdiagnosis or untreated cases. Yunnan Province, located on China's border, reports the highest annual incidence of scrub typhus, highlighting the need to better understand OT infection in both human patients and small mammals in this region. Methods In this study, clinical data on scrub typhus cases in Xiangyun County People's Hospital were retrospectively collected. Nested polymerase chain reaction (PCR) and semi‐nested PCR were used to amplify the 56‐kDa type‐specific antigen (TSA) from samples collected from 64 patients and 93 small mammals, representing six genera and nine species, in Xiangyun County, Yunnan Province, China. Complete sequences of the 56‐kDa TSA for each genotype were obtained through primer‐walking and subjected to evolutionary and recombination analyses. Results A total of 377 scrub typhus cases were enrolled at Xiangyun County Hospital from July 2015 to November 2020. The detection rates of OT in patients and small mammals were 28.13% (18/64) and 13.98% (13/93), respectively. Nine full‐length 56‐kDa TSA genes were identified, comprising four distinct genotypes: Karp‐like (n = 3), Kato‐like (n = 3), Gilliam (n = 2), and TA763 (n = 1). Patients infected with the Karp‐like exhibited significantly more severe clinical symptoms, and the Karp‐like genotype of patients was relatively common in Xiangyun County of Yunnan Province. The Gilliam‐like and Karp‐like genotypes were detected in the infected small mammals, and Apodemus chevrieri is a dominant species in cultivated fields. Recombination analysis revealed genetic overlap among strains of similar or different genotypes, suggesting that genetic diversity may contribute to the increased incidence of scrub typhus. Conclusion At least four genotypes of OT were present among patients, and it was infected by OT that at least four species of  infected small mammals in cultivated areas and at least three species of infected small mammals in residential areas from Xiangyun County, Yunnan Province. The diversity of OT genotypes and infected small mammals, which causes frequent genetic recombination, is the main reason for the adaptive selection due to the genetic evolution of OT.
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spelling doaj-art-462e831934dd4eafa98fa359105eccb62025-08-20T14:34:18ZengWileyVeterinary Medicine and Science2053-10952025-09-01115n/an/a10.1002/vms3.70573Molecular Epidemiology and Genetic Diversity of Orientia tsutsugamushi From Patients and Small Mammals in Xiangyun County, Yunnan Province, ChinaLi Chen0Yi‐Chen Kong1Jia‐Wei Tian2Pei‐Yu Han3Song Wu4Chen‐Jie He5Ti‐Lian Ren6Bo Wang7Lian Qin8Yun‐Zhi Zhang9Institute of Preventive Medicine School of Public Health Yunnan Key Laboratory of Screening and Research on Anti‐Pathogenic Plant Resources from Western Yunnan Yunnan University Key Laboratory of Zoonotic Disease Cross‐Border Prevention and Quarantine Dali University Dali ChinaInstitute of Preventive Medicine School of Public Health Yunnan Key Laboratory of Screening and Research on Anti‐Pathogenic Plant Resources from Western Yunnan Yunnan University Key Laboratory of Zoonotic Disease Cross‐Border Prevention and Quarantine Dali University Dali ChinaInstitute of Preventive Medicine School of Public Health Yunnan Key Laboratory of Screening and Research on Anti‐Pathogenic Plant Resources from Western Yunnan Yunnan University Key Laboratory of Zoonotic Disease Cross‐Border Prevention and Quarantine Dali University Dali ChinaInstitute of Preventive Medicine School of Public Health Yunnan Key Laboratory of Screening and Research on Anti‐Pathogenic Plant Resources from Western Yunnan Yunnan University Key Laboratory of Zoonotic Disease Cross‐Border Prevention and Quarantine Dali University Dali ChinaInstitute of Preventive Medicine School of Public Health Yunnan Key Laboratory of Screening and Research on Anti‐Pathogenic Plant Resources from Western Yunnan Yunnan University Key Laboratory of Zoonotic Disease Cross‐Border Prevention and Quarantine Dali University Dali ChinaInstitute of Preventive Medicine School of Public Health Yunnan Key Laboratory of Screening and Research on Anti‐Pathogenic Plant Resources from Western Yunnan Yunnan University Key Laboratory of Zoonotic Disease Cross‐Border Prevention and Quarantine Dali University Dali ChinaXiangyun County People's Hospital Dali Yunnan ChinaProgramme in Emerging Infectious Diseases Duke‐NUS Medical School Singapore SingaporeXiangyun County People's Hospital Dali Yunnan ChinaInstitute of Preventive Medicine School of Public Health Yunnan Key Laboratory of Screening and Research on Anti‐Pathogenic Plant Resources from Western Yunnan Yunnan University Key Laboratory of Zoonotic Disease Cross‐Border Prevention and Quarantine Dali University Dali ChinaABSTRACT Introduction Scrub typhus, also known as Tsutsugamushi disease (TD), is an acute febrile illness that poses a significant public health threat to nearly one billion people in the Asia‐Pacific region. The disease is caused by Orientia tsutsugamushi (OT) and is primarily transmitted through the bite of chigger mite larvae. Due to its nonspecific clinical manifestations, early diagnosis is challenging, often leading to misdiagnosis or untreated cases. Yunnan Province, located on China's border, reports the highest annual incidence of scrub typhus, highlighting the need to better understand OT infection in both human patients and small mammals in this region. Methods In this study, clinical data on scrub typhus cases in Xiangyun County People's Hospital were retrospectively collected. Nested polymerase chain reaction (PCR) and semi‐nested PCR were used to amplify the 56‐kDa type‐specific antigen (TSA) from samples collected from 64 patients and 93 small mammals, representing six genera and nine species, in Xiangyun County, Yunnan Province, China. Complete sequences of the 56‐kDa TSA for each genotype were obtained through primer‐walking and subjected to evolutionary and recombination analyses. Results A total of 377 scrub typhus cases were enrolled at Xiangyun County Hospital from July 2015 to November 2020. The detection rates of OT in patients and small mammals were 28.13% (18/64) and 13.98% (13/93), respectively. Nine full‐length 56‐kDa TSA genes were identified, comprising four distinct genotypes: Karp‐like (n = 3), Kato‐like (n = 3), Gilliam (n = 2), and TA763 (n = 1). Patients infected with the Karp‐like exhibited significantly more severe clinical symptoms, and the Karp‐like genotype of patients was relatively common in Xiangyun County of Yunnan Province. The Gilliam‐like and Karp‐like genotypes were detected in the infected small mammals, and Apodemus chevrieri is a dominant species in cultivated fields. Recombination analysis revealed genetic overlap among strains of similar or different genotypes, suggesting that genetic diversity may contribute to the increased incidence of scrub typhus. Conclusion At least four genotypes of OT were present among patients, and it was infected by OT that at least four species of  infected small mammals in cultivated areas and at least three species of infected small mammals in residential areas from Xiangyun County, Yunnan Province. The diversity of OT genotypes and infected small mammals, which causes frequent genetic recombination, is the main reason for the adaptive selection due to the genetic evolution of OT.https://doi.org/10.1002/vms3.70573genetic diversitymolecular epidemiologyOrientia tsutsugamushirecombinationYunnan Province
spellingShingle Li Chen
Yi‐Chen Kong
Jia‐Wei Tian
Pei‐Yu Han
Song Wu
Chen‐Jie He
Ti‐Lian Ren
Bo Wang
Lian Qin
Yun‐Zhi Zhang
Molecular Epidemiology and Genetic Diversity of Orientia tsutsugamushi From Patients and Small Mammals in Xiangyun County, Yunnan Province, China
Veterinary Medicine and Science
genetic diversity
molecular epidemiology
Orientia tsutsugamushi
recombination
Yunnan Province
title Molecular Epidemiology and Genetic Diversity of Orientia tsutsugamushi From Patients and Small Mammals in Xiangyun County, Yunnan Province, China
title_full Molecular Epidemiology and Genetic Diversity of Orientia tsutsugamushi From Patients and Small Mammals in Xiangyun County, Yunnan Province, China
title_fullStr Molecular Epidemiology and Genetic Diversity of Orientia tsutsugamushi From Patients and Small Mammals in Xiangyun County, Yunnan Province, China
title_full_unstemmed Molecular Epidemiology and Genetic Diversity of Orientia tsutsugamushi From Patients and Small Mammals in Xiangyun County, Yunnan Province, China
title_short Molecular Epidemiology and Genetic Diversity of Orientia tsutsugamushi From Patients and Small Mammals in Xiangyun County, Yunnan Province, China
title_sort molecular epidemiology and genetic diversity of orientia tsutsugamushi from patients and small mammals in xiangyun county yunnan province china
topic genetic diversity
molecular epidemiology
Orientia tsutsugamushi
recombination
Yunnan Province
url https://doi.org/10.1002/vms3.70573
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