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Discussion on Question
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New Member:
mitch316
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Posted on Saturday, Feb 7, 2009 - 11:09 pm:
Hello, I am new to this site and do not know if this has been discussed before, but I will give it a shot. I am a vet tech (without a vet, she moved away), but the closest thing to a vet this county has. Someone asked me to look at a horse that had been scratching his rear-end until their are sores on it. When I examined him, I found really dry skin, and yellow bumps all over the outer and inner anus. These really look like the common yellow fly eggs (bots, I think) horses always get on their legs out here in the mountains, but I have been on a horse farm my whole life and have never seen them around the anus. Could someone who has seen this before tell me how it was treated? A regular wormer two weeks ago had no effect, and I can't pull them off with tweezers,so I do not think they are pinworms. I am planning on spraying the "screwworm" yellow spray on it, but wanted to research it first. Any help or suggestions would be greatly appreciated. The horse is a four year old gelding who is bright white in color with ice blue eyes and a gray mane and tale. (just in case this is a skin condition for light skinned horses) Thanks a bunch in advance.
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Moderator:
DrO
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Posted on Sunday, Feb 8, 2009 - 12:33 pm:
Welcome Jesse,
Considering your location and time of the year it seems unlikely to be insect related and certainly not a common location for bot eggs. Hmmm...would it be possible to take some well lit and in focus images of the spots and rubbed areas of the horses?
Your description is similar to something I have started seeing the past year: anthelmintic resistant pinworms in older horses. With chronic exposure to the egg masses the irritated skin becomes depigmented in spots but they do not resemble bot eggs. I actually have some images of this, the egg mass appearance, and even the characteristic way horses scratch with pinworms which is different than that with culicoides. For more see Diseases of Horses » Colic, Diarrhea, GI Tract » Parasites and Worms » Pinworms (Oxyuris).
DrO
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New Member:
mitch316
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Posted on Sunday, Feb 8, 2009 - 1:01 pm:
Yes, I am going over today and will get some pictures for you. This is a beautiful horse, and about the best gaited horse I have seen, so I hope you can help shed some light on it. Thanks!
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New Member:
mitch316
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Posted on Sunday, Feb 8, 2009 - 4:56 pm:
Dr. O, Here is the picture. Not as many yellow bumps as before, but still a lot of irritation. You can't see it real well on the picture, but on the bottom side there is quiet a lot of peeling and dry skin. Hope this helps!
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Moderator:
DrO
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Posted on Sunday, Feb 8, 2009 - 6:44 pm:
Great photo. Did you go check the pinworm article Jesse, I thing you will see something very similar but there are other descriptions.
DrO
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New Member:
mitch316
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Posted on Sunday, Feb 8, 2009 - 6:57 pm:
Thanks so much Doc. I did indeed read the articles after I had posted. What had me second guessing myself was the fact that a regular wormer had not cleared it up. The horse is not kept in the cleanest of conditions, so I advised that they do a complete cleaning of the stall. I recommended a second wormer, and treated the area, flanks, and inner thighs with an external spray that I have had lots of success with. It is really to kill maggots and screwworms, but I find it highly effective with just about any external parasites, including deerfly eggs in their ears. Thanks again for your help!
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Moderator:
DrO
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Posted on Monday, Feb 9, 2009 - 8:56 am:
Jesse, don't feel bad. On the farm where we are having problems I missed the diagnosis for nearly six months. Though we looked I did not have a egg case to see, turns out the wife is a fastidious perineal cleaner, and did not think the possibility likely because they were on what I considered a excellent deworming program. The photos in the article are from that farm.
Because of a heavy reliance on avermectins and pyrantel, I have recommended they deworm with the larvicidal dose of fenbendazole as described in the deworming schedule article then begin the program outlined there. It has recently been updated with an eye to prevent this type resistance from developing. I am uncertain how the sprays are going to benefit?
DrO
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