The BHA have announced on Thursday afternoon that more than 100 yards have been sent into lock down in an attempt to try and stop the spread of the equine influenza.
115 yards overall may have suffered from coming into contact with the three possibly infected horses from Ludlow and Ayr on Wednesday or from Wolverhampton on Monday where Donald McCain had runners.
The stables involved with have there entire string will be tested on Friday and some of the yards included are leading trainers Nicky Henderson, Paul Nicholls and Jonjo O'Neill which will be sure to see a lack of racing across Britain during the coming days.
No declarations for runners will be accepted from the trainers involved in this investigation until all horses have been given the all-clear.
The BHA did state on Thursday that they were doing their best to get in touch with all trainers that could possibly be affected by this disease in order to let them know about the precautions they will need to take and under no circumstances to move there horses.
Veterinary samples are set to be taken from all the horses on the premises of the yards that are in lockdown and they will all be sent on Friday to the Animal Health Trust.
This equine influenza has seen all four meetings in Britain cancelled for Thursday with racing scheduled for Friday to be announced later by the regulatory body if it is still to go ahead or not with the outcome not looking lightly off the back of these lockdowns.
If racing did take place in the next 48 hours it would be missing runners from all of these 115 yards that may have been prone to the virus and they will not be allowed to declare runners until the test results are officially revealed.
Nicky Henderson and Paul Nicholls both sent runners to Ludlow on Wednesday meaning that there plans to field some of there stable stars at this weekends meetings in Graded contests at Newbury and Warwick are likely not to happen.
Both trainers have smart horses that were set to run in what was supposed to be there last runs in preparation before the Cheltenham festival which is now less than five weeks away.
(Credit BHA) According to the BHA: "Trainers whose horses may have come into contact with affected horses will be contacted on Thursday and will need to quarantine all horses in the yard.
"This means that these horses must have no contact with any other equines until restrictions are lifted. This is likely to be until samples have been taken from horses and negative test results received."
Jonjo O'Neill was another trainer that was contacted by the BHA in regards to his stable going into lockdown after having some of his horses run at Ludlow and Ayr.
The Gold Cup winning trainer thinks it would be unfair for the yards not involved, who did not have runners on Wednesday to race while others are kept under lockdown.
(Credit Racing Post) The trainer said: "We've received an email saying were are shut down until all the horses here have been tested, which is around 110 at the moment.
“We had two runners at Ludlow and they came back fine. We did move them to the other yard for isolation but to no avail. I hope they don't continue racing in the meantime as it's unfair to us."