Four horses trained by Simon Crisford at Newmarket produced positive tests to EI, with the British Horseracing Authority to announce within 24 hours whether or not racing can resume as it had been scheduled for on Wednesday with meetings at Kempton Park, Plumpton, Southwell and Towcester.
The BHA's Director of Equine Health and Welfare, David Sykes, said, "The BHA and the veterinary committee agree that, on balance, the level of risk is acceptable for a return to racing".
All British racing was put on hold last Thursday after the flu outbreak, which affected horses at Donald McCain's yard.
After consultation with its veterinary committee, and based on the latest tests conducted by the Animal Health Trust, the BHA's Chief Regulatory Officer, Brant Dunshea, confirmed that racing could resume but only with strict bio security controls in place. We are working with the Thoroughbred Breeders Association and wider Newmarket community to attempt to contain the issue'.
The horses that tested positive on Wednesday had been vaccinated - which is mandatory for nearly all breeds used in racing - prompting fears of a widespread outbreak of a mutant strain of the disease.More news: Study Finds Half American Youth With Mental Health Issues Go Untreated
"There have been significant logistical issues associated with testing and processing so many tests in such a short space of time", he said.
8 races in all will thrill and beguile on a day that will be steeped in history as another horse's name is added to the prestigious Kingwell Trophy, and racing celebrates the return of one of the country's most popular sports.
The BHA will then review the declarations to ensure none are entered which do not meet risk criteria.
The British Horseracing Authority (BHA) placed over 170 yards into lockdown in an attempt to halt the spread of the highly-contagious virus.
"As long as they can fulfil that requirement, they are fine".More news: Philippine journalist critical of President Duterte arrested
"Having had the opportunity to consider things over the weekend, the board have made the decision that we are able to support that movement - which is obviously good news for everybody".
"All horses running will be required to have been vaccinated six months before the race day - this will increase the level of immunity by ensuring the vaccinations mitigate horses contracting the virus".
"The critical thing is they have to have had the correct vaccination within the eight weeks preceding the run".
The BHA is finalizing the risk categories in which to slot individual trainers and plans to inform trainers of their eligibility on Tuesday morning.
"The BEF continues to urge horse owners to be vigilant for symptoms of equine flu - coughing, nasal discharge, loss of appetite, lethargy - and call their vet if they think their horses are showing signs".More news: Ozzy Osbourne is out of the ICU