Linking Zoonosis Emergence to Farmland Invasion by Fluctuating Herbivores: Common Vole Populations and Tularemia Outbreaks in NW Spain

Silvia Herrero-Cófreces*, François Mougeot, Xavier Lambin, Juan José Luque-Larena

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

6 Citations (Scopus)
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The expansion and intensification of agriculture are driving profound changes in ecosystems worldwide, favoring the (re)emergence of many human infectious diseases. Muroid rodents are a key host group for zoonotic infectious pathogens and frequently invade farming environments, promoting disease transmission and spillover. Understanding the role that fluctuating populations of farm dwelling rodents play in the epidemiology of zoonotic diseases is paramount to improve prevention schemes. Here, we review a decade of research on the colonization of farming environments in NW Spain by common voles (Microtus arvalis) and its public health impacts, specifically periodic tularemia outbreaks in humans. The spread of this colonizing rodent was analogous to an invasion process and was putatively triggered by the transformation and irrigation of agricultural habitats that created a novel terrestrial-aquatic interface. This irruptive rodent host is an effective amplifier for the Francisella tularensis bacterium during population outbreaks, and human tularemia episodes are tightly linked in time and space to periodic (cyclic) variations in vole abundance. Beyond the information accumulated to date, several key knowledge gaps about this pathogen-rodent epidemiological link remain unaddressed, namely (i) did colonizing vole introduce or amplified pre-existing F. tularensis? (ii) which features of the “Francisella—Microtus” relationship are crucial for the epidemiology of tularemia? (iii) how virulent and persistent F. tularensis infection is for voles under natural conditions? and (iv) where does the bacterium persist during inter-epizootics? Future research should focus on more integrated, community-based approaches in order to understand the details and dynamics of disease circulation in ecosystems colonized by highly fluctuating hosts.

Original languageEnglish
Article number698454
Number of pages13
JournalFrontiers in Veterinary Science
Publication statusPublished - 12 Aug 2021

Bibliographical note

This work contributes to the projects ECOTULA (CGL2015- 66962-C2-1-R) and BOOMRAT (PID2019-109327RB-I00) funded by the Government of Spain, and regional project GESINTTOP (co-funded by Instituto Tecnológico Agrario de Castilla y León—Junta de Castilla y León (ITACYL-JCYL), Diputación Provincial de Palencia and Diputación Provincial de Valladolid). SH-C was supported by a Ph.D. studentship from Junta de Castilla-y-León (co-funded by European Social Fund, Orden 10/11/2016).

We are grateful to all the people that contributed to the long- term vole monitoring over the last 10 years (Leticia Arroyo, Daniel Jareño, Jose-Luis Guzmán, Ruth Rodríguez-Pastor, Juan Romairone, Deon Roos, and Cristina Marín) or contributed to the study of the Francisella—Microtus interactions (Dolors Vidal, Raquel Escudero, Pedro Anda, and Beatriz Arroyo).


  • colonizing rodent
  • Francisella tularensis
  • infectious pathogens
  • intensive agriculture
  • land-use changes
  • Microtus arvalis


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