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Animal Health Trust |
Interim Report – August 2011 #7 (30.08.11)
United States of America
Equine infectious anemia (EIA):
An extensive outbreak of EIA has been reported on a premises in Arkansas. The report indicated that two horses have died on the farm about 4 weeks ago displaying signs suggestive of EIA. Prior to their burial, blood samples were collected and these turned out to be positive for EIA. The remaining 83 odd horses on the premises were bled and 40 of them were confirmed positive for EIA, none of which exhibited signs of illness. All 40 seropositive animals have been euthanized and buried. The herd in question is essentially a "closed herd" with only 4 horses having moved off the premises over the past 10 years. Horses on adjacent premises continue to be tested and so far, no further EIA positive animals have been identified. Investigations into determining the possible source of virus for this outbreak are continuing. Remaining horses on the index premises are quarantined and will be retested for EIA later.
Equine Herpesvirus Myeloencephalopathy (EHM):
A 15-year-old mare in Northern California had to be euthanized after developing neurologic disease following exposure to EHV-1 (neuropathogenic strain). Two cohorts on the affected premises became febrile and nasal swabs from both horses were positive for EHV-1 (neuropathogenic strain). No signs of neurologic involvement have developed in either animal.
Potomac Horse Fever. (PHF):
Cases of PHF have been diagnosed in horses from several counties primarily in central Kentucky. Since May, a total of 14 cases have been confirmed either on PCR or IFA testing. Three horses died with clinical signs and lesions consistent with infection with Neorickettsia risticii.
Regards
International Collating Centre