Fertility of the aborting mares was good, as only 1 of the 6 aborting mares was barren in the following breeding season.
In this outbreak with 61 clinically affected horses, 6/7 pregnant mares aborted and 8 horses developed EHM.
"The mares that aborted last year are back in foal," said David Switzer, executive director of the Kentucky Thoroughbred Association, thankful that one major concern had been laid to rest.
In two mares that aborted on day 1 and 11, no fever was detected.
Some farm owners believe that mares who have aborted could be bred again this spring, although others view this as a risky proposition.
Each stallion's registration certification must show a fully purebred pedigree extending back four generations, as well as records of mares covered, percentages of pregnancies aborted, still-born and live-born, and numbers and genders of foals born.
He added: "It is a disaster, especially as Danedream cannot take part in the Arc at the orders of the special vets". Swamp fever is easily passed on and can cause mares to abort their foals as well as sudden death.
Women have always aborted.
