Nightshade and Ivermectin: A Deadly Mixture

Editor’s note: When researching the unknown illness story on this page, the following study on ivermectin’s interaction with a noxious weed was discovered. Nightshade and other poisonous plants should be eliminated from pastures.

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Four Horses Dead, One Ill; Dewormer Questioned

Four horses on a South Texas farm died from unknown causes in February; one horse is recovering. The horses’ owner suspects the problems might have been caused by a dewormer; she has necropsy and other test results, but she has not released them

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Mouth Ulceration

My 7-year-old Tennessee Walking Horse has developed ulcers on the bars of his mouth. Any ideas why this would happen?

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WNV: A Threat to Unvaccinated Horses

As spring approaches and temperatures rise, growing mosquito populations will increase the risk for deadly mosquito-borne diseases, including West Nile virus (WNV) and equine encephalomyelitis (sleeping sickness).

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A New Model for Predicting Outbreaks of West Nile Virus

Infectious diseases were wreaking widespread havoc long before scientists had any idea what caused them. But knowing the pathogenic agents behind today’s scourges is just the first step in protecting against deadly outbreaks. Roughly 75% of

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Exercise Exhaustion (Book Excerpt)

Many exercise-induced problems could be avoided by applying common sense limits to performance stresses. If you plan to compete at eventing and endurance riding, make sure both you and your horse are appropriately prepared.

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Human WNV Vaccine Tested

A team of U.S. and U.K. researchers have shown that an experimental West Nile virus (WNV) vaccine shows promise in protecting humans from the arbovirus. The study abstract appeared online April 14 in the early edition of the Proceedings of

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WNV Treatment Trial Begins

GenoMed, a medical genomics company, is seeking horses to participate in a free trial to test a medical protocol for treating West Nile virus (WNV). David W. Moskowitz, MD, MA, FACP, chairman, CEO, and chief medical officer for GenoMed, said the

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Kentucky’s EIA and West Nile Surveillance Program

During 2005, a total of 121,813 samples were tested for equine infectious anemia (EIA). For the first time since regulatory testing was initiated in the 1970s, no positive animals were identified (Figure 1). Private testing accounted for 101,650

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Protect Against EEE in Florida

The Florida Department of Agriculture and Consumer Services Division of Animal Industry sent an e-mail to Florida practitioners last week reminding them to make sure horse owners safeguard against Eastern equine encephalitis (EEE), and reminded

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The Gift of Sight

The lessons I learned from this experience are that if an eye infection does not resolve–or look much improved–in a week, then seek an ophthalmologist or at least ask your veterinarian to take samples of the infected area for further study.

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Worldwide Disease Outbreaks

The International Collating Centre, Newmarket, England, and other sources reported the following disease outbreaks during the fourth quarter 2005.


Cases of abortion caused by equine herpesvirus-1 (EHV-1) were reported from New South

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More African Horse Sickness?

A horse that died in late March on a farm on the border of the Worcester and Roberson Districts of the Western Cape of South Africa is being tested for African horse sickness (AHS), according to a report by Dianne Hawker first published in the

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