A recent survey by the equestrian federation's veterinary department found that at least 23 horses eligible for the Games have piroplasmosis.
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Conyers City Manager Roland Vaughn said horse park officials have known for some time that piroplasmosis would probably block international events in the future.
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One unresolved dispute involves who will pay for the strict quarantine of horses that test positive for piroplasmosis, a tick-borne disease.
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But none of the horses that arrived Sunday tested positive in Europe for piroplasmosis or three other diseases that would disqualify them from competition.
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Irvin said the quarantine conditions set out in his letter would ensure that the horses carrying piroplasmosis would not pose a threat to American horses.
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For the 1984 Olympics in Los Angeles, the U . S . official said, a temporary waiver was approved despite the threat of piroplasmosis.
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At least two foreign horses that won Olympic titles last time have piroplasmosis, a tick-borne disease to which American horses aren't immune.
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At issue was whether Georgia would allow several horses infected with a tick-born disease, equine piroplasmosis, to enter Atlanta for the Summer Olympics.
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Maggard said investigations were underway by the international equestrian federation to determine precisely how many Olympic horses were infected by the tick-borne disease called Piroplasmosis.
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The culprit is equine piroplasmosis _ a tick-borne parasitic blood disorder that infects a horse and causes fever, swelling and, often, death.
