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Horse Health Watch


More info on EHV-1 (Rhino) outbreak in Florida 1-1-07

Horse Health Alert - Equine Herpes Virus

The USDA and FDACS command post has been established to evaluate and possibly quarantine horses examined in Palm Beach County and the surrounding areas. 866-568-2836.

Florida Dept of Agricuture is providing updates.

Link to EHV-1




FAQ below is from that site.




Frequently Asked Questions: Equine Herpes Virus-1
February 17, 2006


J. Liv Sandberg
UW Madison
Equine Extension Specialist

Dr. Larry Bauman
UW-River Falls
Extension Veterinarian

What is Equine Herpes Virus-1 (EHV-1)?

Equine Herpes Virus-1 (EHV-1) is a contagious viral disease of horses that can cause respiratory disease, abortion and occasionally neurologic disease.

Is there another name for Equine Herpes Virus?

Rhinopneumonitis or ‘rhino.' It is a herpes virus that is common among horses.

How is the EHV-1 disease spread?

Aerosol (airborne) and fomites (feed, clothing, boots, hands, etc.)

Can EHV-1 spread to humans?

No, but people can transport the virus on their clothes, boots, etc.

Can EHV-1 spread to other species of animals?


What are the clinical signs or symptoms seen with EHV-1?

Respiratory disease, abortion and occasionally neurologic disease (lack of coordination, inability to stand, etc.)

Are these clinical signs similar to any other equine diseases we have in our horse population?

Yes. Equine Influenza Virus may cause respiratory disease. Equine Viral Arteritis may cause abortions, and West Nile Virus may cause neurologic disease.

If my horse has some of the above clinical signs, will I be able to tell which disease he/she may have contracted?


Is there a vaccine available to help prevent the spread of EHV-1?

Yes, but it doesn't directly protect against the neurological form of the disease cause by EHV-1.

My horse is up to date on its vaccinations, including EHV-1. Can my horse still be at risk of contracting the disease?

It's possible, but horses that have not been vaccinated are at a much higher risk.

Will EHV-1 affect all of my horses or are some of my horses at more of a risk of contracting the disease?

Young, old, weak, high exposure, immune challenged, and stressed horses are more likely to get sick.

How long will it take for my horse to show clinical signs of the disease after he/she has been exposed to the disease?

Horses can shed the EHV-1 from the onset of clinical signs until 1-2 weeks after the clinical signs are gone. A 21 day quarantine period following the disease is recommended.

How do you test for EHV-1?

A blood test is available. Test results will usually take 3-7 days to be completed.

I only have one horse. Do I have to be concerned about my horse contracting EHV-1?

Yes. While the virus is spread more readily from horse to horse via infected droplets in the air, on facility surfaces, fences, buckets and a common water source, etc., there is also the possibility of spreading the disease as a result of droplets being carried on clothes, boots, jackets, etc.

As a horse owner, what should I do to prevent the potential spread of the EHV-1?

Horse owners do not need to panic, but they should following appropriate bio-security measures such as those listed at the end of this article.

What about vaccinations?

There are vaccines available to protect horses against EHV-1. Since EHV-1 is a common virus in horses, it is recommended that all horses be vaccinated at least once a year. For horses congregating at shows and competitions, more frequent vaccinations may be recommended. Consult your local veterinarian to discuss the risk potential and vaccination recommendations for your horse.

What disinfectant(s) are best to use for cleaning my facilities?

Generic disinfectants such as bleach, chlorhexidine, quaternary ammonias and others are effective in killing the EHV-1 virus.

I have only a couple horses. Do I have top follow the preventative measures?


I have an active and full barn of horses that frequently travel through out the state and out of state. What preventative measures should I be practicing to minimize the risk of spreading EHV-1?

See the recommendations for isolation and bio-security measures listed at the end of this article. Prior to traveling with your horses, check on the current health status of horses at your final destination.

My farrier is scheduled to come and work on my horses' feet? Should I still have him/her come or cancel the visit?

Have them come unless there is a high level of disease in surrounding barns. Practice the appropriate bio-security measures, regardless of area farm status. If the work is not needed immediately and there is a high level of disease in the area, rescheduling to a later date may be the wisest decision.

If I have new horses coming to barn, what should I do before they arrive and after they arrive?

Your horses should be up to date with their EHV-1 vaccinations. Quarantine/separate the new arrivals for 3 weeks.

We like to trailer to another barn and ride. Can we still do this?

While your barn may not be under quarantine, the potential to spread the disease is minimized if horses are not exposed to additional sources of contamination. It is important to still enjoy spending time with your horse. However, by taking the initiative to keep unnecessary travel to a minimum, the potential for spreading EHV-1 will be reduced.

How long should we not travel from barn to barn during an EHV-1 outbreak?

No definitive answer can be given as the length of time is dependent on the success of minimizing the EHV-1 outbreak.


  • Immediately isolate any sick horses in the barn. Isolate any new horses or horses returning from another location or show for at least 7 days. If horses were exposed to sick horses while away, take further precautions and isolate horses for at least 21 days.
  • As the EHV-1 virus can be spread on clothing, all human traffic (clients taking lessons, borders, visitors, trainers, blacksmiths, veterinarians) should be vigilant about disinfecting boots before entering and leaving a different barn, wearing clothing (ex: jeans, jacket) that have not been worn in another horse barn, and washing hands before handling the horses. At the entrance of the barn, provide a tub of disinfectant and instructions for all to use. Bleach water (1 part bleach to 10 parts water) may be used and should be changed daily. Phenolic based disinfectants will be less effective if a lot of feces and other organic material collects in the tub, so clean out and replace the disinfectant solution regularly.
  • Do not rotate horses from stall to stall. Don't share feed tubs or water buckets among the horses. Inserting a water hose previously submerged in a bucket of a sick horse can potentially spread a virus.
  • Disinfect any areas of the barn that may have been exposed to a sick horse or a horse that is of question, including disposal of all bedding and hay/feed. The above disinfectants can be used. If the stall is needed, allow disinfectant to dry before placing a horse in the same location.
  • Always work with the sick horses(s) last in your chore routine and exit the barn without completing any other tasks.
  • When possible, separate horses into small groups to minimize the number of horses that may be exposed if you do have an infected horse.

Copyright 2006
Country View Veterinary Services
1350 S. Fish Hatchery Rd.
, WI 53575
March 2, 2006










EHV-1 outbreak in Florida

December 15, 2006


Equine Herpesvirus type1 Status – Florida State Officials in Florida are investigating a possible outbreak of Equine Herpesvirus – type 1 (EHV-1) in the Wellington, Florida area. Travel in and out of Florida is NOT restricted at this time.


From the Florida Department of Agriculture and Consumer Services: The Division of Animal IndustryRegarding Equine Virus  

FOR IMMEDIATE RELEASE: December 15, 2006 From the Florida Department of Agriculture and Consumer Services: The Division of Animal Industry Equine Herpesvirus type1 Status – Florida State Officials in Florida are investigating a possible outbreak of Equine Herpesvirus – type 1 (EHV-1) in the Wellington, Florida area. Affected animals have been associated with the importation of horses through the USDA New York animal import station. Laboratory confirmation is still pending. Thus far, 2 horses have been euthanized and other animals have had clinical signs. Two quarantines have been placed while state and federal officials are investigating the cause of the disease and working with affected industry to prevent further spread of the disease. No other state or federal restrictions have been placed on horse movements into, within, or out of Florida. Although EHV-1 can be a serious disease of horses and the virus can spread through the air for respiratory infection, transmission generally requires direct or close contact between horses. Horses with clinical signs should be isolated and kept 40 feet or more from other horses. Owners with sick horses should contact their private veterinarian to examine and treat their horses. Veterinarians suspecting EHV-1 with neurological signs are advised to contact state officials. Vaccines are available and concerned owners should discuss whether vaccination of their animals is recommended, the type of vaccines available, and the frequency of recommended vaccination with their veterinarian. For more information, please see the following web sites: My Horse Univ of Kentucky Last Updated: December 14, 2006






EVA problem in New Mexico, USA--summer 2006


Information from the United States Dept. Agriculture on Equine Viral Arteritis



July 12, 2006 - This year, the Ruidoso Horse Sales Co. will require all horses entering their sales to provide results for an EVA test in addition to Coggins papers and health certificates.

The paperwork is required on all horses, including in-state animals. The original or copies of the forms must be in the sales office at least 10 days prior to the sale date. The EVA test results must be dated within 90 days of the date of the sale. Coggins must be dated within six months of the date, and health certificates must be dated within ten days of the sale.

All animals will be inspected at the time of unloading, and any showing clinical signs of EVA will not be permitted in the stable area. Horses vaccinated for EVA must show proof of vaccination including dates and negative EVA test prior to vaccination, signed by the attending veterinarian.

Samples may be tested at your nearest approved diagnostic center, or by calling the sales company at (505) 378-4474 to obtain submission forms for the approved laboratories. For any questions, call sale veterinarian Leonard Blach at (505) 420-8119.



This is the policy being developed in 2005-2006 to identify the source of animals, including horses, in the US in an attempt to control disease spread.
See the full article at the Travel website-->animal identification policy
see link above
2005 article
July, 2005--tho note that these press releases are not dated.
More info at sites noted








This is to notify you that the Vesicular Stomatitis (VS) quarantine on two horses on a Travis County, Texas, premises has been released. Currently, Texas has no animals or premises under quarantine for the sporadically occurring blistering disease that can affect horses, cattle, swine and a number of other species.

Until the threat of vesicular stomatitis (VS) ceases to exist, Dr. Bob Hillman, executive director of the Texas Animal Health Commission (TAHC) has directed all Texas accredited veterinarians who write a certificate of veterinary inspection for any livestock moving interstate from Texas to make the following determination and provide this statement on the certificate:

"The animals represented on this certificate of veterinary inspection have not originated from a premises or area under quarantine for vesicular stomatitis or a premises on which VS has been diagnosed in the past 30 days. I have examined the animals and have found no signs of vesicular stomatitis."

Furthermore, animals entering Texas from a state affected by vesicular stomatitis must have a current certificate of veterinary inspection with this statement.

Although the Texas VS quarantine has been released, it is still a good idea to call the state of destination prior to travel to ensure your animals have met all entry requirements.

Information about VS and case counts in affected states may be accessed through the web site for the Texas Animal Health Commission (TAHC) at The latest report indicates Arizona has 19 premises under quarantine, and New Mexico and Utah have two premises each under quarantine.





The Colorado Department of Agriculture web site is at You can stay up to date on the case counts and states affected by going to the Texas Animal Health Commission web site at; and selecting the link to "USDA Vesicular Stomatitis Information Page." As of July 12, the current number of premises quarantined because of VS: Arizona 13; New Mexico 6; Utah 4; and Colorado 1.

LAKEWOOD, Colo. - Colorado has become the fifth state in the country to have a confirmed case of vesicular stomatitis virus (VSV). A six-year-old horse in Delta County tested positive for the disease, and the premise has been placed under quarantine.

"VSV is not a human health issue, but it can have severe economic impact on livestock owners, especially in the dairy industry," said Wayne Cunningham, state veterinarian at the Colorado Department of Agriculture. "The disease usually doesn't result in an animal's death, but the main reason we watch it closely is due to fact that the symptoms closely resemble foot-and-mouth disease, which is much more economically devastating."

In 2004, 148 horses, 119 cattle, four sheep and goats, and two alpacas were infected with the disease, involving a total of 107 premises across the Colorado.

Vesicular stomatitis is a viral disease that is usually not fatal but causes painful lesions around an infected animal's mouth, nostrils, teats and hooves, symptoms similar to foot-and-mouth disease. Only laboratory tests can differentiate the diseases. All disease samples from Colorado were sent to the National Veterinary Services Laboratory in Ames, Iowa, for testing.

VSV primarily affects cattle, horses, and swine. These blisters enlarge and break, leaving raw tissue that is so painful infected animals generally refuse to eat or drink and show signs of lameness. Severe weight loss usually follows.

Since the disease is believed to be spread by insects, preventative measures include keeping susceptible animals in dry corrals and stables, using insecticides and insect repellents daily, providing good nutrition and practicing best management techniques.

Prior to 2004, the last case of VSV in Colorado was diagnosed in 1998. Although vulnerable, humans are rarely infected with the disease and usually display flu-like symptoms. In addition to livestock, other susceptible animals include llamas, goats and wild animals such as deer, bobcats and raccoons. For more information on VSV, visit our Web site at 

Garlic can cause Anemia in horses, academic studies show:
This article is from a commercial site that provides info on natural remedies and treatments for certain problems,and does sell some
Garlic Causes Anemia in Horses

Many horse owners feed their horses garlic to fend off flies and insects,
but in a study performed at the
University of Guelph and published in the
American Journal of Veterinary Research confirmed that horses will
voluntarily eat enough garlic to result in anemia. Horses ate voluntarily
gradual amounts of garlic and brought up to the maximum amount (4.4 oz for
an 1100-lb horse twice daily) over a 41-day period, and feeding continued
for an additional 71 days. Research found that an intake of only 3.5 oz
for an 1100-lb horse did cause anemia. The anemia resolved itself over a
five-week period after stopping the garlic, but damaged red cells and
abnormally high MCV (mean cell volume) were still detectable. Intake of
over 3.5 oz twice a day for 10 weeks was sufficient to damage the red cells.
This study also found that horses are more sensitive to garlic effects than
(Horse Journal Volume 12 Number
7 July 2005) 

ALERT:  VS resurgence in April 2005 brings about embargo in Kentucky, additional required testing for states surrounding NM and Arizona.


April 2005 3751 and others

Kentucky officials have prohibited the entry of all livestock, wild and exotic animals into the Commonealth from Grant County, N.M. Vesicular stomatitis was confirmed yesterday (April 27) in a horse in Grant County, and one other horse portrayed clinical signs of the disease. Kentucky's Administrative Regulation 302 KAR 20:115 prohibits entry of such animals from VS-affected and -embargoed areas.

On April 27, the USDA's National Veterinary Services Laboratories (NVSL) in Ames, Iowa, confirmed the finding of vesicular stomatitis virus (VSV) in horses at one premises in Grant County, N.M. This is the first confirmed case of vesicular stomatitis in the United States in 2005.

Vesicular stomatitis is a viral disease that primarily affects horses, cattle, and swine. Vesicular stomatitis virus has a wide host range and can occasionally infect sheep and goats. In affected livestock, VSV causes blister-like lesions to form in the mouth and on the dental pad, tongue, lips, nostrils, hooves, and teats. The blisters swell and break, leaving raw tissue that is so painful that infected animals generally refuse to eat and drink and show signs of lameness.

Severe weight loss usually follows, and in dairy cows a severe drop in milk production commonly occurs. Affected dairy cattle can appear to be normal and will continue to eat about half of their feed intake.

The Animal and Plant Health Inspection Service's Veterinary Services and the New Mexico Livestock Board will continue to monitor the situation and conduct response activities in an effort to minimize trade restrictions.

For additional information on vesicular stomatitis, visit:

This is intended as general information and updates that may be of educational interest to clients and students.
LR, agent is not responsible for the accuracy of the content, tho every effort is made to be certain the information is valid and current.
Contact your vet for any further questions.

site copyright ler 2004