All four horses were put through their paces in a workout at Newmarket on Tuesday morning.
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Mr Campbell said four horses at one yard were being treated after beginning to show symptoms on 29 January.
And the news that four horses were killed in three separate races at Aintree on Thursday will surely prompt further reviews.
The Chipping Norton-based Heythrop Hunt has halted rides after four horses at one yard tested positive for the potentially fatal virus.
Forty-five minutes later, four black horses with black plumes lead the McLaren cortege along the street.
And so it proved, with the horse, trained by Aidan O'Brien, leaving the four other horses behind and in a hurry.
Makybe was the first to win the Melbourne Cup three times, in 2003, 2004 and 2005 (four other horses have won it twice).
In addition to the 11 horses that tested positive on April 9, Al Zarooni in co-operating with the investigating officers also admitted that he had given steroids to four more horses.
He stole the four bronze horses from the basilica of San Marco, destroyed the boat-building capacity of the Arsenale, and demolished a church in Piazza San Marco to build a memorial to himself.
"Other changes meant only horses over the age of four could compete, and horses were not allowed to wear blinkers, " he adds.
Four if its horses at one yard tested positive for the potentially fatal virus.
It may not offer the same cash as other international competitions, but Royal Ascot last year attracted the top four rated race horses in the world -- Frankel, Cirrus Des Aigles, Black Caviar and Excelebration.
Takeover Target is one of four Australian-trained horses who have travelled to England to tackle the two sprints at the famous Berkshire meeting.
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This year, he was one of four people who determined the horses that would be individual betting interests in the first round of the people.
In each stride horses lift all four hooves off the ground at once, something that George Stubbs, the most famous horse painter of the last 300 years, had guessed at but which, until Muybridge, had never been proved.
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The number of police officers in the mounted section is to be cut from 12 to eight, the number of support staff will go from six to four and the number of horses will be cut from 12 to 10.
Animal-rights activists scored four out of six, protecting horses from butchers in California and bears from baiters in Missouri, as well as ending cockfights in Missouri and Arizona.
Wayne Lukas has won the Derby four times and is live with two horses this year.
Thirty horses, six butlers and four lorryloads of luggage accompanied the family to their holiday cottage.
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Edward Braddock, he escaped injury although four bullets ripped his coat and two horses were shot from under him.
The big race of the first day of the festival is the Sagitta Jockey Club Stakes, a Group Two race for older horses run over one mile four furlongs.
Those numbers nearly match the Bugatti Veyron, which costs four times as much and packs hundreds more horses under the hood.
The disease can develop when horses distribute their weight unequally among their four legs, which is common when they are distressed, in pain, or uncomfortable.
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Four out of five of them had been attacked by Trojan horses that sniffed out confidential information by logging keystrokes, recording internet sites visited, and reporting the findings to a third party.
The American Quarter Horse Association and the entities that profit when AQHA profits as well as the four US agencies that manage public lands for federally protected wild horses and burros in the West and along the Atlantic barrier islands and peninsulas.
Four others ponies from the rescue have been taken to HorseWorld in Bristol, while four more have already been removed to the Society for the Welfare of Horses and Ponies in Monmouth.
Given the general volatility of thoroughbred racing, and the fact that the horses are, by rule, 3 years old, the favorite has only managed to win four times in the last 33 years (or 12% of the time, but who's counting).
Godolphin's Certify, unbeaten in four career outings and winner of the Shadwell Stud Fillies' Mile at Newmarket last September, was one of the horses to test positive and will not be allowed to take part in the 1, 000 Guineas at Newmarket next month.
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