EHV-1 and EHV-4 Outbreaks

[QUOTE=Home Again Farm;5614991]
An outbreak was just reported in Jonesville (just outside of Gainesville FL).

http://www.gainesville.com/article/20110518/ARTICLES/110519493/1169[/QUOTE]

Page two of the article states that it isn’t related to the western states outbreak. I wonder how it popped up there?

Eurodressage has a blurb, primarily regarding the situation in Canada.

http://www.eurodressage.com/equestrian/2011/05/19/neurotropic-equine-herpes-virus-1-reported-united-states-and-canada

[QUOTE=CDE Driver;5615093]
Page two of the article states that it isn’t related to the western states outbreak. I wonder how it popped up there?[/QUOTE]

Although the western outbreak is getting a lot of press, for whatever reason, outbreaks aren’t that uncommon. There was one in New Jersey not that long ago, and that farm came off quarantine in the last few weeks. There are usually several outbreaks every year, that are not related to one another. It is just that right now the western outbreak is getting a lot of press, but there are others, too.

[QUOTE=CDE Driver;5615093]
Page two of the article states that it isn’t related to the western states outbreak. I wonder how it popped up there?[/QUOTE]

If you read my post, just slightly above, it explains how it can “pop” up anywhere.

Basically just about the entire horse population is a latent carrier of EHV1 and for the few that aren’t who are vaccinated, they have some protection through the vaccine. But once they get EHV1, they’re a latent carrier. It then will pop back up in the latent carrier when the horse is under some sort of duress and/or weakened condition. It comes back up as the neurological form of it, called nEHV1. It’s more severe, more painful, has more consequences and is very contagious.

Very similar to chicken pox in people - just about everyone has had chicken pox thus everyone is a latent carrier of the varicella Zoster virus - when under duress, it pops back up as the more severe neurological form of it, commonly called shingles, but it’s technical name is herpes zoster. Shingles is more severe, extremely painful, can have more serious consequences, but it “pops” up just anywhere. Even chicken pox in kids can have very serious consequences - a certain percentage of children suffer strokes because of zoster giving them permanent neurological effects, some kids die and then most kids have some uncomfortable itchy spots for a while and just recover without any problems whatsoever.

Similar in horses, EHV1 can cause mild symptoms in some horses, severe in others, death in still more. When it comes back as it’s more sinister neurological form, the consequences are even more severe. You can’t really ever 100% prevent it. As breeders, we can vaccinate our preggies to give the foals some protection and then keep vaccinating our youngsters to give them some immunity, but even that won’t necessary stop them from getting infected - just they will have had the advantage of the previous vaccinations forewarning and preparing their immune systems to combat it better with less dire consequences. Keeping your horses in prime nutritional condition, not overcrowding, deworming, vaccinating, and keeping your farm tidy and maintaining good cleanliness practices helps your horses keep their immune systems in top condition and those horses have the most likely chance of overcoming any disease.

Colorado dressage horse infected

I just got this notice from RMDS:

IMPORTANT

PLEASE BE ADVISED THAT A HORSE THAT WAS AT THE CHEYENNE DRESSAGE CLUB SHOW HAS COME DOWN WITH EHV-1.

The horse was from Colorado and started exhibiting symptoms when it got home. The vet has confirmed that this is EHV-1.

Double ugh. I just looked at Canterbury’s show schedule. They had a USDF show last weekend, and have a jumper show and driving show coming up this weekend.

http://www.canterburyshowplace.com/sched11.html

The good thing is that the horses on the Jonesville farm have had no contact with other horses. So, hopefully no other horses in the area have been exposed.

My best mare was showing at Canterbury last weekend.

This is a mutated form of EHV-1

One of the infected horses is 7 miles up the road from me, that horse was at the Ogden show - all confirmed infected horses came from that show. Ten confirmed infected horses in CA, 300 nasal swabs out for testing. The best count I’ve seen is here http://www.equidblog.com/2011/05/articles/another-category/equine-herpesvirus/ehv-outbreak-numbers/

And here:
http://www.cdfa.ca.gov/ahfss/animal_health/equine_herpes_virus.html

All horses have NOT been put down. Not all horses shed after being infected - some do. Some shed that have been exposed to regular EHV (1 or 4).

By the way - bleach and/or chlorohex are not enough to safeguard if you KNOW you are dealing with an infected horse. They help, but CFDA is requiring some special compound for biohazard protocol because the common bleach and chlorahex are not 100% effective.

Most of our vets are receiving daily updates, so if you are really worried, talk to your vet. My vets are recommending STAY PUT - don’t go anywhere. No shows, no clinics, no lessons, no trail rides for the next couple of weeks until we have a better idea whether this has spread beyond the horses that were in Ogden. It does screw up breeding season for a few weeks (and show season) - I don’t feel comfortable hauling my stallion to the stallion station right now, but a few weeks is a small price to pay compared to a dead horse. And the disease has a high incidence of fatality.

[QUOTE=Jasmine;5613091]
There are already two possible cases in WI.
http://www.chicagotribune.com/news/chi-ap-wi-equineherpes-wisc,0,6272172.story[/QUOTE]

That is not correct. Two Wisconsin horses were at the competition, however, according to the State Veterinarian, those horses have not returned to WI.

http://datcp.wi.gov/news/?Id=305

Horses from at least 29 states may have been exposed to equine herpes virus-1 or EHV-1, at a recent Utah competition. There is no human health threat. Two horses owned by Wisconsin residents, but kept in another state, competed in Utah. They did not enter Wisconsin after the competition.

MysticOakRanch bought up a good point… is there any idea on how this is going to affect breeding season for those who haul their stallion into a clinic for collection? Is anyone changing plans? Suppose I should send out an email to the SO Im using so I dont make any plans.

Actually, the horse from ALberta apparently had Wobbles, not EHV-1. They still don’t know the source of the outbreak. If you go to the U.S. Cutting Horse Association (or whatever the official name is) website, they post the owner-released vet records from the horse who was euthanized at Ogden…negative results from multiple tests for EHV-1.

J.

[QUOTE=Home Again Farm;5615214]
The good thing is that the horses on the Jonesville farm have had no contact with other horses. So, hopefully no other horses in the area have been exposed.

My best mare was showing at Canterbury last weekend.[/QUOTE]

Any idea how horses that were supposedly self contained and not being exposed to the outside suddenly are having EHV-1 pop up ?
If they truly were isolated how the heck did one or both of them turn up with it.

so, any news about California horses? what about your pony PP? is she ok?

also, while i don’t really know much about viruses, i do know they mutate all the time. that is why each year the human (in)flu(enza) shots change… virurus mutate very rapidly.

also, i think that we are talking about two different diseases here… the horse gets EVH-1 and then (due to immune response??) can develop the neurological portion of the disease.

or barn is on lock down - no horse in or out on vets orders… hopefully everyone will do similar so this doesn’t develop into something nasty…

[QUOTE=mbm;5615934]
so, any news about California horses? [/QUOTE]

There were 2 more horses diagnosed in Corning, CA today.

I saw this about the dressage horse at the Cheyenne show:

5/19/11 3PM A dressage horse that attended the Cheyenne Dressage show on May 14th came down with a fever and tested positive for EHV-1. The horse had been exposed to the family’s cutting horse (Ogden cutting show) prior to attending this show. The dressage horses that attended this show are now being asked to monitor their horses’ temperatures in case they came in contact with the infected horse.

[QUOTE=wehrlegirl;5615787]
MysticOakRanch bought up a good point… is there any idea on how this is going to affect breeding season for those who haul their stallion into a clinic for collection? Is anyone changing plans? Suppose I should send out an email to the SO Im using so I dont make any plans.[/QUOTE]

I can still send out shipments, but I’m requesting as much notice as possible. Normally I haul my boy to UC Davis, but I do have somebody that will come to my house to collect him. It’s just takes more planning. I was going to send two mares to get bred with frozen in the next two weeks, and that is definitely not happening right now.

My county is taking it pretty seriously. Most barns are on lockdown, and events are being canceled left and right. Basically what people are saying around here is don’t freak out, but don’t be ignorant about it either. Most of us are hunkered down for the next few weeks until we get a better idea on how easily this is spreading.

not necessarily true, this was posted as an updated to the Alberta conference call yesterday:
Conference Call Update on EHV-1
May 19, 2011
EHV-I virus situation in Alberta

A large group of equine veterinarians, provincial veterinarians and the Alberta Veterinary Medical Association had a conference call today regarding this issue. We reviewed the outstanding cases at this time and they are as follows:

There is one confirmed neurologic case which showed neurologic signs on May 1, 2011 and was isolated at that time. This horse did not attend the Utah show but was in direct contact with the horses attending the above stated show before they left Canada. This horse has been under veterinary care and is recovering very well and is in no danger. The origin of the source of contact for this horse remains unknown.

As of May 18, 2011 there is one yearling confirmed positive for EHV-1 which showed only respiratory signs of the disease similar to normal influenza infections. This horse was in direct contact with tack from the horses returning from Utah. This horse is under treatment and isolation and is in no danger as this time.

As of May 18, 2011 there is an additional confirmed positive case of a horse returning from Utah which showed a mild transitory respiratory disease. This horse is under isolation and treatment and is in no danger.

There are 6-8 tests pending on horses similar to the above horse, which have attended the Utah show and have experienced mild respiratory disease. We expect some of these horses to have a positive test and have taken this into account on our comments below.

There are 3 confirmed cases in BC who attended the Utah show and have varying degrees of neurological disease but are all responding to treatment at this time.

Therefore, at this time, there have been no horses affected in the province of Alberta or BC that were not either at the Utah show or in direct contact with these horses, either before or after their return. The incubation period for this disease can be as long as 21 days but normally symptoms show within the first 10-14 days. Presently, we are within the 10-14 day timeframe.

Measures that have been taken:

Competitions involving the horses directly affected by the Utah Show have been cancelled by the Cutting Horse Association until further notice.

All of the participants attending the Utah show have been notified and asked to isolate their horses.

The Chief Provincial Veterinarian is gathering all information, monitoring the disease and is looking into the epidemiology of EHV-1 in Alberta at this time.

Ongoing recommendations:

All horse owners have been asked to carry out normal biosecurity protocols which can be found on many websites, including that of the Alberta Veterinary Medical Association.

Any horse owner who has potentially been in contact with this group of horses should monitor the temperature of their horses twice daily for 14 -21 days post exposure and discuss any abnormalities with their veterinarian.

The protection afforded by vaccination is debatable and we recommend that horse owners discuss it with their veterinarian, as every horse is unique and requires a different vaccination protocol.

It is the opinion of this group of veterinarians the risk associated with attending a competition or event is very low at this time. This is due to the fact, only one horse has been affected with the neurologic form in Alberta and currently there has been no “second wave” of infection. We will be monitoring this situation closely and will update this position if there is any significant change.

Greg Andrews DVM

What is presented as the autopsy report for the Canadian horse (“Uncle Kunkel”) that was euthanized in Utah can be viewed on the NCHA web site at http://www.nchacutting.com/ag/shows/pdf/herpes/autopsy_report_20110518.pdf

That report confirms that the horse tested negative multiple times for EHV-1 and indicates that the index animal for the outbreak had not been identified at the time of writing the report.

[QUOTE=FLIPPED HER HALO;5615987]
There were 2 more horses diagnosed in Corning, CA today.

I saw this about the dressage horse at the Cheyenne show:

5/19/11 3PM A dressage horse that attended the Cheyenne Dressage show on May 14th came down with a fever and tested positive for EHV-1. The horse had been exposed to the family’s cutting horse (Ogden cutting show) prior to attending this show. The dressage horses that attended this show are now being asked to monitor their horses’ temperatures in case they came in contact with the infected horse.[/QUOTE]

someone on FB posted that a horse in Santa Rosa had died, but I am not able to get any verified information about that…

anyone here anything about this?

Nobody is going in or at at my house. Thankfully, I have no vet or farrier appts for a few weeks. But I am really hoping this doesn’t ruin my chances of breeding my mare. I already have the frozen picked out but I am scared of hauling her to a huge clinic that gets a lot of traffic in and out. Let’s hope everybody stays home and this blows over quickly.

[B]

Nobody is going in or at at my house. Thankfully, I have no vet or farrier appts for a few weeks. But I am really hoping this doesn’t ruin my chances of breeding my mare. I already have the frozen picked out but I am scared of hauling her to a huge clinic that gets a lot of traffic in and out. Let’s hope everybody stays home and this blows over quickly.[/B]

That’s like us too. Bought Romanov and For Compliment frozen…so excited about using these stallions but found out about this outbreak literally hours before we were supposed to haul to repro clinic. Turns out my repro vet had a horse at Ogden which is in quarentine at her place (not showing any signs so far). I don’t know…I think the mares might get a year off. I am soooo scared of this disease, especially with babies here.

I heard through the grapevine that as of today there are two more confirmed cases in Alberta…