Pathophysiology and Epidemiology of Equine Diseases (PhEED) Unit
Head of Unit: José Carlos Valle-Casuso
The Pathophysiology and Epidemiology of Equine Diseases (PhEED) Unit is based in Normandy. Its expertise in equine health is recognised at national, European and international levels. The work of the PhEED Unit is broken down into four themes: epidemiology, which monitors the appearance and/or spread of major and emerging disorders and analyses their causes; bacteriology, whose research themes focus on bacterial reproductive diseases (including contagious equine metritis) and the bacterial causes of equine mortality; virology, with in particular the study of equine viral arteritis, equine infectious anaemia and equine herpesviruses; and parasitology, whose activities mainly concern the study and characterisation of equine trypanosomoses such as dourine, surra and nagana and their infectious agents (Trypanosoma equiperdum, Trypanosoma evansi and Trypanosoma brucei).
Reference activities
The unit holds five national reference mandates (NRLs) for contagious equine metritis, dourine, equine viral arteritis, equine infectious anaemia and equine herpesviruses.
It is also the European Union Reference Laboratory for equine diseases other than African horse sickness. These include the five diseases for which it is the NRL, as well as surra. This mandate is held jointly with the Virology UMR of the Laboratory for Animal Health.
Lastly, the unit is a World Organisation for Animal Health (WOAH) reference laboratory for dourine and contagious equine metritis.
Surveillance activities
The PhEED Unit monitors the appearance and/or spread of major and emerging equine disorders. It analyses their causes, in particular through the national surveillance network on the causes of equine mortality (Resumeq), which it runs, and through epidemiological investigations in the field. The unit is also involved in a project on the combined use of demographic and health data on horses.
Resumeq
The Normandy site of the ANSES Laboratory for Animal Health has been running and coordinating the national equine mortality surveillance network (Resumeq) since 2015. The network now has 45 members. Its ambition is to centralise all the necropsy results produced by veterinary schools, departmental laboratories and equine veterinarians in France, in order to obtain a precise picture of the causes of equine mortality throughout the country. To date, more than 1400 equine necropsy cases have been recorded in the national database. The epidemiological surveillance scheme has already identified threats at local, regional and national levels and its geographical coverage is gradually expanding. The choice of data collected and the development of various tools for standardising these data were decisive steps in the construction of this network. The PhEED Unit's experience in diagnosing the causes of mortality in Equidae and its historical database (containing necropsy data covering more than twenty years) have enabled it to finely classify the causes of mortality according to several levels, and create the first specific thesaurus for Equidae. This first thesaurus of causes of equine death has been translated and published via an open-access article, with the aim of opening Resumeq up to other countries, especially in Europe. The long-term objective is to establish international collaborations with a view to extending Resumeq and the surveillance of causes of mortality to other European countries.
Research activities
The PhEED Unit specialises in infectious and parasitic diseases of horse reproduction, as well as persistent and/or emerging infections of major importance for the equine sector. Within this framework, it studies and characterises infectious and parasitic agents in horses, and develops diagnostic tools and control measures for these diseases.
The themes studied by the PhEED Unit include:
- Molecular characterisation and typing of isolates of Taylorella equigenitalis, the agent of contagious equine metritis, and Taylorella asinigenitalis, circulating in equine and asinine populations in France and Europe.
- Ecology study of the agent of contagious equine metritis within the equine genital tract microflora in order to refine detection and control methods.
- Study of virulence and antimicrobial resistance in pathogenic bacteria of equine origin taken from the necropsy culture collection and epidemiological investigations.
- Development of new serological and molecular diagnostic methods for dourine and "equine trypanosomoses".
- Study of the molecular mechanisms underlying the different transmission methods of animal diseases due to parasites of the Trypanozoon sub-genus responsible for fatal diseases in domestic animals and humans.
- Coordination of the Resumeq equine mortality surveillance network.
- Structuring of epidemiological surveillance in the equine sector through a project to combine the use of demographic and health data on horses (ValDonEqui).
- Study of the development of antimicrobial resistance in the main bacterial species responsible for abortion and stillbirth in Equidae.
- Molecular characterisation (NGS, WGS, etc.) of strains of equine infectious anaemia and equine viral arteritis found in France and Europe.
- Improvement of serological and molecular diagnostic methods for equine infectious anaemia and equine viral arteritis.
- Study of host-pathogen interactions in order to better understand the mechanisms of persistence of equine viral arteritis and equine infectious anaemia viruses in horses.
- Identification of synthetic and/or natural compounds with antimicrobial properties in order to develop targeted treatments against viruses and bacteria infecting Equidae, as an alternative to antibiotic therapy.
The Sabot Joint Technology Unit (UMT)
The Sabot UMT (its name comes from the French for "Equine health and welfare – sector organisation and traceability") was set up in early 2022 for a period of five years. It brings together the PhEED unit and the French Horse and Riding Institute (IFCE) and aims to strengthen their joint research activities with regard to horse health. The unit's work will focus on three main areas: equine census and mortality monitoring, risks associated with parasites and pathogens in the horse environment, and infectious diseases related to reproduction.
Main research projects
Partnerships specific to the PhEED Unit
- LABEO Franck Duncombe
- French Institute for Research for Development (IRD)
- University of Tours
- Claude Bernard University, Lyon 1
- French National Institute for Health and Medical Research (Inserm)
- French National Centre for Scientific Research (CNRS)
- Ecole Nationale Supérieure de Lyon
- The Queen's Medical Research Institute, Centre for Inflammation Research, University of Edinburgh (UK)
- The Roslin Institute, Royal (Dick) School of Veterinary Studies, University of Edinburgh (UK)
- University of Glasgow (UK)
- Laboratorio de Diagnóstico, Clínica Equina SRL, Buenos Aires, (Argentina)
- Center for Microbes, Development and Health, Unit of Discovery and Molecular Characterisation of Pathogens, Institut Pasteur of Shanghai, Chinese Academy of Sciences (China)
- Albert Einstein College of Medicine, Department of Virology, New York (USA)
- Pasteur Institut (Paris)