Journal article

Globetrotting strangles: the unbridled national and international transmission of Streptococcus equi between horses

Catriona Mitchell, Karen F Steward, Amelia RL Charbonneau, Saoirse Walsh, Hayley Wilson, John F Timoney, Ulli Wernery, Marina Joseph, David Craig, Kees van Maanen, Annelies Hoogkamer- van Gennep, Albertine Leon, Lucjan Witkowski, Magdalena Rzewuska, Ilona Stefanska, Monika Zychska, Gunther van Loon, Ray Cursons, Olivia Patty, Els Acke Show all



The equine disease strangles, which is characterized by the formation of abscesses in the lymph nodes of the head and neck, is one of the most frequently diagnosed infectious diseases of horses around the world. The causal agent, Streptococcus equi subspecies equi, establishes a persistent infection in approximately 10 % of animals that recover from the acute disease. Such 'carrier' animals appear healthy and are rarely identified during routine veterinary examinations pre-purchase or transit, but can transmit S. equi to naïve animals initiating new episodes of disease. Here, we report the analysis and visualization of phylogenomic and epidemiological data for 670 isolates of S. equi recover..

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Awarded by Horse Trust

Awarded by Petplan Charitable Trust

Awarded by Wellcome Trust

Funding Acknowledgements

The Horse Trust funded the collection of S. equi from outbreaks of strangles in the UK (G1606) and the sequencing of the Se4047 reference genome. A. S. W., C. R., C. M. and K. F. S. were funded by awards from the Horse Trust, Estate of Paul Mellon Foundation, Alice Noakes Memorial Charitable Trust, Ivo Trust, Tattersalls, The Elise Pilkington Charitable Trust, The European Breeders Fund, The Serth and Gates Charity, Margaret Giffen Charitable Trust, The Payne Gallwey Charitable Trust, The Stafford Trust, Marjorie Coote Animal Charity Trust, Beryl Evetts and Robert Luff Animal Welfare Trust, and The Anne Duchess of Westminster's Charitable Trust. S. W. was funded by a grant from the Sir Peter O'Sullevan Charitable Trust. J. R. N. was supported through a combined contribution to the Animal Health Trust's Equine Infectious Disease Service from the Horserace Betting Levy Board, Racehorse Owners Association and Thoroughbred Breeders' Association. H. W. was funded by a grant from the Petplan Charitable Trust (S19-741-780). R. C. and O. P. were supported by the New Zealand Equine Research Foundation. S. R. H., J. P. and M. T.G. H. were supported by the Wellcome Trust (grant number 098051). J. F. T. was supported by the Grayson Jockey Club Research Foundation and the Keeneland Association Endowment.