May 18, 2012

Streptococcus myositis – the consequence

If you remember the horse that I wrote about last month – starting here – Streptococcus Myositis – a vaccine reaction

Well the story does not have a happy ending, which is why it has taken awhile to update all of you. I let the owners grieve for their loss and then I asked them today if I could post the update. Not only was the owner willing to let me post the update but I also have pictures so you can see what devastation this vaccine reaction can have.

Here is Tango in Tennessee where the owners first saw him and they tried him out on trail. Notice even in the shade you can see his good body weight and dappling. He looks overall like a healthy horse. He was given the vaccine earlier in the week as well as his Coggins test in anticipation of him being sold to the new owners and brought up to Illinois.
tango51907.jpg

Four weeks later and a few days before he was euthanized (put down). He is a good 300 lbs lighter.
tango62107.jpg

Tango tried hard and was at one point on the road to recovery. His blood values were increasing, meaning the anemia seemed to be improving. Unfortunately the treatment for this disease is to lower the immune system with corticosteroids, so the body stops attacking itself. There are two risks in this treatment – 1.) laminitis (founder) just from the corticosteriod use and 2.) another infection taking hold due to the lowered immune system. Even though Tango was on antibiotics, his lungs filled with fluid, possibly a consequence of the steroid use or possibly another infection causing pleuropneumonia. His temperature never remained stable and his blood values were sinking again. When he finally stopped eating and looked depressed again, enough was enough and the decision was made to put Tango down. Even though his new family had him just over a month and the majority of the time he was sick, he will be sorely missed.

His owners have this to say – “We do not want his death to be in vain; Please let this story of his death be a reminder of what powerful effects vaccines have on the immune system. Horse owners need to be conscious of what they are giving their horse. Hopefully this will save at least one other horse.”

Streptococcus myositis – A Strangles vaccine reaction, part 3

Here we are back at the story of our little horse that was vigorous and strong only 3 weeks ago and now looks like it has lost 300 lbs, has a severe anemia in which the owner has given one blood transfusion, and has a fever that is on again and off again and has spiked now to 109.5! That is not a typo – the horse’s temperature was at 109.5 degrees during the day when the outside temp was near 90. Bathing the horse and putting it under fans and giving some Banamine reduced the fever, but that was very scary!

So what happened next. Well my friend who owns this horse being a small animal veterinarain asked me a simple question, can the horse still have immune mediated anemia and have a negative Coombs test. Well I’ll be – a question I did not know the answer to – LOL. So he asked a clinical pathologist, a doctor who specializes in reading blood results and other laboratory tests. He’s the doctor we get on the phone with when all the blood results look screwy and we have no idea what way the blood is directing us. He is the guy that makes sense of it all. So the answer came as a startling yes. The horse can have immune mediated disease and still have a negative Coombs test. OK well then what now?

The clinical pathologist then asked the most important question of them all, the one that solved this mystery. When was the horse last vaccinated and with what? Did it have a strangles vaccine recently? YES, it did have a strangles vaccine at the same time the Coggins test was pulled. Well looking at the results of the blood tests and the signs and symptoms of your horse, he believes the horse has vaccine induced immune mediated anemia. Otherwise known as Streptococcus myositis caused by a reaction to the Strangles vaccine. It is much more prevalent in Quarter Horses but can happen in any breed. The theory is if the horse already has a high titer to Strangles and the vaccine is given anyway it sends the immune system into overdrive and causes purpura hemorrhagica and results in a immune mediated myositis (muscle inflammation and deterioration).

So that is what I was seeing not a trauma induced bloddy nose but rather purpura hemorrhagica. Also the horse was tying up but the cause was not because of being cast but rather an immune mediated myositis. Here is a picture of what I saw – The picture is from the Merck Veterinary Manual Website -
purpura.jpg
Notice the nose looking like it was hit with something.

The horse seems to be doing better, however, we are not out of the woods quite yet. He still needs some TLC to get better and as I said before the Rapid Response is helping this horse tremendously. I will keep you posted on the events with this horse, but hopefully this story will help you realize as to how important it is to be informed on your decisions to vaccinate with what and when. It may be more important to not vaccinate for certain diseases as is my opinion with strangles. If you are not in a high risk environment (meaning stabled with a bunch of 2 year old show horses that come and go every weekend) then it is more important to pass on this vaccine. Your horse’s life may depend on not being vaccinated!

Streptococcus myositis – A Strangles vaccine reaction, part 2

Heres a continuation of yesterday’s story – A strangles vaccine reaction

So what happened next? The horse spiked a fever, the very next day; oh and not just a little 103, no it went big, spiking to 105-106 degrees! OK so now I am thinking this horse has an infection most likely shipping fever. The immune system is stressed the horse had been trailered several hours, it is in a new place, new bacteria, new viruses that it has never been exposed to, so great after all this horse has been through it now has shipping fever.

Well the Banamine knocked the fever right out and we continued giving the horse iv fluids (a treatment for the tying up); the horse’s temperature was back to normal within a couple of hours. The horse feels better and starts eating. So we put the horse on antibiotics as a preventative, and yes for all my holisic followers we were doing other things such as probiotics, immune support and Rapid Response. In fact the owners and myself feel that the horse benefitted the most from Rapid Response out of anything that we tried (again hindsite is 20/20 and considering the makeup of this product it makes sense that the horse received the best results from using it).

Well after some more bloodwork we noticed that the white blood cells (WBC’s) were still normal and the red blood cells (RBC’s) were getting lower (anemia). So this horse ‘s disease is now an anemia and a fever that comes and goes. We needed more diagnostics, so in going with the possibility of shipping fever we needed radiographs of the chest to determine if we were indeed dealing with a lung infection and possibly abscesses as the fever was coming and going and the WBC’s were remaining at a normal level. So we sent the horse to another friends place that had the facility to take such a radiograph (x-ray), luckily this is a small horse so it is possible to shoot an xray. Well fortunately for the horse, but unfortunately for diagnosis, the chest films were OK. Blood work done by this veterinarian showed that the liver enzymes were elevated. It concerned him more than me. He was thinking liver infection (hepatitis), but I was thinking the horse just tied up a few days ago and has been sick for almost two weeks now, the liver enzymes are going to be elevated. After a couple days of more fluids in our friends facility and a change in antibiotics the horse was brought home, looking no better with not very many answers as to what this horse had, the next step was a liver biopsy to rule out the hepatitis.

Well that is when I put my thinking cap on…so what do we have here…the biggest sign is the anemia all the other things going on with this horse are symptoms, so lets start with the anemia. The differential diagnosis (what disease cause anemia in horses) are stomach ulcers, chronic infection, Equine Infectious Anemia (Coggins test), cancer such as lymphoma, and immune mediated. Stomach ulcers – too quick of an onset for this horse and most of the time the horse does not have a fever, but still possible. Chronic Infection – this horse was extremely healthy and very strong just prior to coming to Illinois and the WBC are normal, which in chronic infection could happen, but not likely. Equine Infectious Anemia (EIA) – Coggins test taken last month was negative but this does not mean that the horse could not have contracted the disease since then, and all the symptoms fit – intermitten fever, anemia, none responsive to antibiotics – Uh-OH could it be my first time ever seeing a postive Coggins test??? Unfortunately we would have to wait 45 days to do another test to see if it was postive or not and this horse may be dead before then. Then again the only edema (swelling) seen was in the head and usually horses with EIA have edema along there belly. So we are not sure but it is fitting the best so far. Cancer (Lymphoma) – no other signs, this horse was extremely healthy two weeks before, and it is only 4 years old, again posible but not likely. So it must be immune mediated – we need to do a Coombs test. If it is postive we have our answer, if not back to the drawing board.

After this discussion I told the owners that I was out of answers you need to consult with an internal medicine specialist at a university. SO they did, they contacted the University of Illinois and talked with one of the internal medicine doctors there, who thought the EIA did fit the entire disease process but so did immune mediated disease, so he suggested continue supportive treatment and do a Coombs test.

Well the Coombs test turned out to be negative! The story continues tomorrow and you will not believe the one simple question that solved this riddle asked by yet another doctor.