Catterick's first Flat meeting of the season today has been abandoned because it falls within a foot-and-mouth exclusion zone.
Clerk of the course John Gundill said: "They've cancelled us. I don't know exactly where the new outbreak is. We've just been told by the British Horesracing Board we cannot race."
Rain is once again threatening to disrupt the fixture list, with doubts over a number of meetings this week.
Officials at Nottingham will hold a precautionary inspection this morning ahead of today's Flat card after a forecast of heavy rain.
Prospects for racing at Leicester tomorrow do not look good and the local stewards will inspect the track this morning.
However, Exeter are "cautiously optimistic" racing there will go ahead as planned the same afternoon despite the threat of further rain.
Hugo Bevan, clerk of the course at Huntingdon, has announced that Friday's meeting there is now an all-chase fixture.
Aintree, where the Grand National meeting is due to get under way tomorrow week has avoided the recent downpours.
Charles Barnett, Aintree's managing director, reports the track in good condition.
Kieren Fallon ended nine months of frustration yesterday at Wolverhampton and insisted he never had any thoughts of quitting the saddle.
The three-time champion's hopes of winning on his first ride in Britain since injuring his left shoulder last June were thwarted when Wintertide was beaten a head in the Henry Royce Maiden.
"It's taken longer than I thought it would to come back but it never crossed my mind that my career was over," he said
He surprisingly nominated outsider Jimmy Fortune as a man to watch in the title race.
Johnny Murtagh's lean spell as a Hong Kong club rider ended prematurely after last Sunday's Derby meeting. His stint was due to end this Saturday. Murtagh rode just one winner from his 40 rides since beginning his spell there on February 19th.
Frankie Dettori believes he has only an outside chance of regaining the British jockey's championship he won in 1994 and 1995.
The Italian rode only 46 winners last season, having spent two months on the sidelines after being injured in a plane crash at Newmarket on June 1st which claimed the life of pilot Patrick Mackey.
He returns to action in Britain today with three rides at Lingfield Park.
Dettori, whose wife Catherine recently gave birth to their second child, has not ridden in Britain since landing a double on Compton Bolter and Mellow Jazz at the Surrey track in November.
"The likelihood of me becoming champion is a 100 to 1," he said.
"I'm not going to fly again in the little planes so I'll probably just stick to one meeting a day in the summer."
