Following the British Horseracing Authority's announcement that racing is suspended in Britain because of equine influenza and consultation with the IHRB Board, Veterinary Committee, Irish Equine Centre and HRI overnight, the IHRB confirm these decisions in the context that at present within Ireland the disease risk status in racing Thoroughbreds has not yet changed.
McCain sent out runners at Wolverhampton on Monday and both Ayr and Ludlow on Wednesday before the test results were revealed on Wednesday night.
Bosses at Dunstall Park announced the move to abandon the Saturday evening meeting as the probe into the outbreak was being investigated today.
Four British meetings were scheduled for Thursday - Huntingdon, Doncaster, Ffos Las and Chelmsford.
That means that a race meeting offers a prime breeding ground for the disease, which is why racing today has been cancelled.More news: Brown and McCallum added to Scotland squad
Irish trainer Gordon Elliott ran a number of horses at Ayr on Wednesday but his runners were still travelling back home when the news of the positive tests broke and they were quickly placed in isolation away from his stables.
Hose races have been cancelled all over Britain because it's come out that three horses in an active yard have been diagnosed with equine influenza.
Equine influenza is a highly infectious disease of horses, mules and donkeys occurring globally caused by strains of Influenza A virus.
The governing body's statement added: "The BHA is presently communicating with yards potentially exposed to ensure appropriate quarantine and biosecurity measures are put in place and horse movements restricted to avoid possible further spread of the disease".
The BHA conceded "the full extent of potential exposure is unknown" but is working as fast as possible to gather information about any potential spread of the outbreak.More news: F1: Haas Reveals New Black And Gold Livery For 2019 Challenger
Since the incubation period for equine influenza can be up to 72 hours, samples will be taken on Friday from horses that raced at Ayr and Ludlow and sent to the Animal Health Trust in Newmarket for analysis.
It can be airborne over reasonable distances as well as be transmitted indirectly, including via people.
"It's not a case of whether other horses are infected but whether they might be and, of course like humans, they may not show any symptoms".
It is the most potentially damaging of the respiratory viruses that occur in United Kingdom equines and disease symptoms in non-immune animals include high fever, coughing and nasal discharge.More news: XFL hiring a big name coach