Equine Herpes/Rhino Outbreak

Last post 11-24-2011 1:01 AM by brylle28. 6 replies.
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  • 05-27-2011 4:31 AM

    Equine Herpes/Rhino Outbreak

    I received this in my email this morning:

    DEADLY EQUINE VIRUS - ALL HORSE PEOPLE PLEASE READ

    by Top Hatt Equine Center on Sunday, May 15, 2011 at 9:36pm
    There has been an outbreak of a horrid equine disease: Rhino EHV-1 (Equine Herpesvirus). This is a mutant strain of the neurological variation of Rhino, there is no vaccine for it, and it is lethal.
    There are multiple confirmed deaths due to EHV in Arizona, California, Utah, Colorado, Canada, Idaho, and unfortunately, is spreading like you cannot believe. It is believed that a horse with the virus attended the NCHA Western National Championship cutting in Ogden, UT and has caused a massive cross contamination. All the horses that are dead or are being treated were vaccinated for Rhino, it doesn’t matter, this strain does not respond to any vaccine. The first death was a Canadian cutting horse that attended the Ogden show, there have been more in Weld County Colorado, there is a barrel racing stable in Colorado that has a confirmed case, which shows that it is rapidly and easily spreading through different disciplines and through many venues - CSU is now full and most Vets are not accepting Rhino horses, and have considered worldwide experts in this matter. This is considered an emerging disease. It is behaving in an extreme manner.
    A similar outbreak occurred before, and at CSU, despite the fact the school runs one of the nation's top veterinary biosecurity programs, the EHV virus spread to over 20 equine patients on the premises, and spread out of control.

    The EHV-1 organism spreads quickly from horse to horse and the neurologic form of the virus can reach high morbidity and mortality rates. The incubation period of EHV-1 is typically 2-10 days, but there has been a case of a horse showing symptoms as many as 12 days after contamination. In horses infected with the neurologic strain of EHV-1, clinical signs may include: nasal discharge, discoordination, hind end weakness, recumbency, lethargy, urine dribbling and diminished tail tone. Prognosis depends on severity of signs and the period of recumbency.
    There is no specific treatment for EHV-1. Treatment of symptoms may include intravenous fluids, anti-inflammatory drugs and other appropriate supportive treatment. Currently, there is no equine vaccine that has a label claim for protection against the neurological strain of the virus.

    Horse-to-horse contact, aerosol transmission, and contaminated hands, equipment, tack, and feed all play a role in disease spread. They cannot stress enough about the cross contamination, this deadly virus can be on anything - your steering wheel in your truck, door handles, trailer latches, your purse, your hat, sunglasses, cell phone, pop or food wrapper, bucket, feed pan, hay bag, rubber bands, brushes, tack, boots, clothing, ANYTHING you touch or rub against could have the virus on it!
    PLEASE monitor your horses, the first symptom of this disease is a spike in temperature of 102 degrees. Horses with severe clinical signs of neurological EHV-1 illness are thought to have large viral loads in their blood and nasal secretions and therefore, present the greatest danger for spreading the disease. Immediate separation and isolation of identified suspect cases and implementation of appropriate biosecurity measures are key elements for disease control.

    This is a serious matter that demands immediate attention, becoming aware and knowledge about this detrimental outbreak is a necessity – and we ALL, as equine owners, trainers, and event producers MUST do our part to STOP the spread of this horrible mutant and deadly virus. Serious thought needs to be made on hosting events within infected states and their bordering neighbors. Many national level events that are scheduled within the next month have been CANCELLED to STOP THE SPREAD of this disease.
    This information is taken from very reliable sources, here are a couple articles you can read for yourself below. We will be hearing a lot more about this, please stay alert to the latest information.

  • 05-27-2011 8:43 AM In reply to

    Re: Equine Herpes/Rhino Outbreak

    I'm sorry to say but this email is fraught with inaccuracies and the originator's own added emphasis and gravitas that borders on unfounded panic. And it's hard to tell what parts were copied and pasted from dubious sources, mixed in with the author's own subjective opinion. And, yes. I would call some horse association websites dubious sources.

    Here's what the American Association of Equine Practitioners, AAEP (veterinarians and other horse professionals), has to say about EHV-1: 


    In a nutshell, the mutation of EHV-1 that IS lethal to horses is EHM, Equine Herpesvirus Myloencephalopathy. Not the EHV-1 virus by itself. And almost all horses get exposed to EHV-1 by the time they are 2 years old. But not all horses will show any symptoms of it. They become carriers and can occasionally "shed" the virus to other horses with no previous exposure, have weak or compromised immune systems and do become clinical. And there IS a vaccine against EHV-1. Just not the EHM mutation. And even just regular immunization against Equine Rhinovirus also seems to help suppress EHV-1 in many but not all horses. That's what's called an "off label" use of the vaccine.  

    The seemingly sudden interest in EHV-1/EHM from the outbreak at a reining and cutting show late April/early May in Ogden, Utah has many people believing that's where this inferred nationwide outbreak started. Not true. EHV outbreaks occur anywhere at any time. The Utah event got a lot of attention because it turned into the lethal EHM mutation and affected some very expensive horses that got sent back to their regional homes before it was detected and quarantined. We've had at least 2 horses here in Central Florida euthanized because of EHM in the past few weeks and they or their stablemates were never out of the state all winter. Nor was anyone connected with them. And many, if not all, of the scheduled shows and competitions down here are being cancelled as a precaution against spreading EHV-1 because nobody knows if it will mutate to EHM.

    Just like the human disease Chickenpox, once exposed the virus can remain dormant in the body for a lifetime and reoccur in one form or another and "shed" when the carrier is under stress. That stress could be excessive heat, heavy exercise or weakness from another infection or injury. 

    When the dust settles from this current hand-wringing over EHV-1 your horses, my horses, everyone's horses will still be just as susceptible to infection as they have always been. IMO, all we can do is continue to practice good stable management, keep up a regular immunization schedule that includes EHV-1 and rhinovirus vaccine and hope for the best. Just like we always do. ~FH
  • 05-27-2011 11:06 AM In reply to

    Re: Equine Herpes/Rhino Outbreak

    Sorry!  Wasn't trying to spread any inaccuracies, it was a post forwarded through our local dressage and eventing club newsletter.  I must say I am completely freaked out! I am afraid to take my horse anywhere!  I appreciate the corrections.  So the regular vaccine for rhino is a good defense against this?  I didn't realize it had spread to Florida. Terrifying!
  • 05-27-2011 12:41 PM In reply to

    Re: Equine Herpes/Rhino Outbreak

    FocusCalmPatience:
    I didn't realize it had spread to Florida.
    It hasn't spread to Florida. It's always been here. And EHV-1 has a vaccine but none for the EHM mutation. Getting the EHV-1 shot MAY help prevent a full EHV-1 attack that could advance to EHM. But there's no guarantee it won't. The Rhinovirus shot is not intended to treat EHV-1 but anecdotal evidence suggests it has a positive effect. ~FH
  • 05-27-2011 4:11 PM In reply to

    Re: Equine Herpes/Rhino Outbreak

    The EVM has hit WA state, and my vet suggested not taking any of my girls away from home until the break out is confined. She said maybe a few weeks until that is confirmed. I'm not freaking out, but the woman giving Juno a massage yday was careful to disinfect her hands and change her shirt before her next client. She's always washed her hands, but changing her shirt is new since the break out.
    Megan


    "The horse you get off is not the horse you got on. It is your job as a rider to ensure that as often as possible, the change is for the better."

    Anonymous




  • 06-01-2011 9:46 AM In reply to

    Re: Equine Herpes/Rhino Outbreak

    It IS something to be taken seriously...but also not something to panic over.

    the key is taking a pro active approach to the situation..and many organizations are doing this, by canceling or postponing shows to FORCE people to stay home so this run of the virus has time to run it's course.

    not unlike many illnesses..it is always "here"..but there are outbreaks, some big, some small. some horses will recover, some will die..

    Here in Texas, we have had many cutting shows canceled..and are even seeing this spread into non cutting events..I think it's a good idea personally. my vet has advised no horses on or off the place for about a month.



  • 11-24-2011 1:01 AM In reply to

    Re: Equine Herpes/Rhino Outbreak

    You may have heard about the “outbreak” of neurologic herpes (rhinopneumonitis) that recently occured. I’d like to take this opportunity to tell you what really happened and help you assess the risk your horse faces and let me assure you, the risk is usually relatively low.

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