1. School of Veterinary Science, University of Liverpool, Liverpool, United Kingdom.
2. Department of Infection Biology, Institute of Infection and Global Health, University of Liverpool, Liverpool, United Kingdom.
3. Faculty of Veterinary Medicine, University of Agronomical Sciences and Veterinary Medicine, Iasi, Romania.
4. Department of Epidemiology and Population Health, Institute of Infection and Global Health, University of Liverpool, Liverpool, United Kingdom.