Associations between ecological diversity and rodent plague circulation in Yunnan Province, China, 1983-2020: A data-informed modelling study

PLoS Negl Trop Dis. 2023 Jun 22;17(6):e0011317. doi: 10.1371/journal.pntd.0011317. eCollection 2023 Jun.

Abstract

Background: Following its resurgence in 1982, rodent plague has been linked to a wide range of circulation risks in Yunnan Province. The most serious public health concern associated with effective plague control is determining how various ecological variables influence the differential risk of transmission.

Methods: We investigated the population dynamics of the hosts and vectors using large-scale epidemiological surveillance data. In a seasonal eco-epidemiological model, we evaluated the impact of ecological conditions on the vectored flea index (VFI) to determine the rate of plague transmission.

Results: The findings revealed a changing species composition in natural foci over time. Additionally, shifting distributional ranges of species by elevation may be vital in modulating the VFI. The model estimates indicate that the dynamic VFI contributes to spatiotemporal variance in transmission.

Conclusions: The VFI could be a critical ecological indicator, allowing for real-time tracking and prompt intervention in the circulation of rodent plague. Understanding eco-epidemiological diversity can provide essential insights into effective responses to future plague resurgence.

MeSH terms

  • Animals
  • China / epidemiology
  • Epidemiological Models
  • Plague* / epidemiology
  • Rodent Diseases*
  • Rodentia
  • Siphonaptera*
  • Yersinia pestis*

Grants and funding

This work was supported by the National Natural Science Foundation of China under Grant 30960331 and 81660554 (ZG), Support Plan for Talents in Yunnan under Grant YNWR-MY-2018-035 (ZG), Major Science and Technology Project of Yunnan Province under Grant 202002AA100164 (ZS), the Start Fund for Specially Appointed Professors of Jiangsu Province (RL), Xu Jianguo Academician Workstation under Grant 2018IC155 (ZG), and Yunnan Provincial Key Laboratory for Control and Prevention of Zoonosis (CS). The funder of the study had no role in the study design, data collection, data analysis, data interpretation, or writing of the manuscript.