The five horses that Gordon Elliott ran at Ayr on Wednesday have not returned to his yard, the trainer revealed on Thursday morning.
The quintet are instead at a non-racing isolation yard as they were potentially exposed to the outbreak of equine flu.
Three of them won but the yard infected, believed to be that of Donald McCain, also had a runner on the card.
This, potentially, puts all the horses who were at Ayr at risk of infection.
Elliott’s Veinard won the 2m handicap chase at Ayr in which the McCain-trained Raise A Spark trailed home last of four.
"The horses we ran at Ayr yesterday never came back to our yard and instead went to a non-racing isolation yard that is about 25 minutes away from where we are based.,” Elliott said on his Betfair blog.
“We’ve been told that the chances of this effecting our runners from yesterday is very remote but we can’t take any chances whatsoever and those horses that went to Ayr will be quarantined as long as they have to be.
“Hopefully everything will get back to normal in Britain as quickly as possible but from our point of view it’s business as usual and we’re sending seven horses to Thurles today."
Elilott has seven runners at the Thurles meeting, which gets under way at 1.15 and can be viewed live on Racing TV.
Meanwhile, Paddy Power are betting on when racing in the UK will resume.
They make it 1-5 before February 18; 5-1 March 1st or after; and 6-1 between February 18 and February 28 inclusive.