potential exposure is unknown". The disease has been spreading across northern Europe, with the Republic of Ireland, France, Belgium and the Netherlands all affected. Within the week following the initial UK infections, four further vaccinated horses tested positive for equine flu in stables in Newmarket, but after six days the BHA declared that (with stricter rules regarding vaccinations) racing would resume. While some in the industry welcomed the resumption of racing, Dr Richard Newton, of the Animal Health Trust warned that British racing is "not out of the woods yet". Eight times as many flu cases were reported among UK horses in the first six weeks of 2019 as in the whole of 2018, and there was particular concern about its appearance in vaccinated horses and thoroughbreds. The outbreak continued at an elevated rate for the first half of the year and a peak in cases was seen at the end of June. From mid-August only isolated sporadic cases were seen. See also Avian influenza Canine influenza References Further reading Campbell, Ballard C. ed. American Disasters: 201 Calamities That Shook the Nation (2008) pp. 131–32 Law, James. "Equine Influenza Epidemic" in Report of the U.S. Commissioner of Agriculture for the year 1872. (Washington, 1872). McClure, James P. "The epizootic of 1872: Horses and disease in a nation in motion." New York History (1998) 79(1):4-22. External links Equi Flu Net EI Vaccination Debate - Australia equinetrader.co.nz COntrolling Equine Influenza - Japan equinetrader.co.nz Great Epizootic of 1872 equinetrader.co.nz Caring for a horse with equine influenza Horsetalk.co.nz (NZ) Equine flu resources: Q&A, latest news, contacts Horsetalk.co.nz (NZ) Veterinary Record Equine Quarterly Disease Surveillance Reports Horse Flu Great Epizootic of 1872 ravaged the horse population - Pantagraph (Bloomington, Illinois newspaper) Horse diseases Influenza Animal viral diseases Animal vaccines