b'Arizona Ask the VetREAL COUNTRY SUMMER SORESthe magazine A Habronema is susceptible to ivermectin, so in areas horseman\'s term for a skin conditionwhere summer sores are present, it is best to administer caused by theivermectin to all horses. A repeat administration of Mike Barna larvae of Habronemaivermectin in one month is ideal, as the flies that carry or Draschia speciesthe larvae can remain in the environment for several Publisher worms is "summerweeks. Protection from ticks and fly larvae may be one of ArizonaRealCountryMagazine@gmail.com sores." The adult wormsthe first modifications that should be considered.of these species live on the inside wall of theSolitude IGR or Simplifly, oral feed additives that act Erika Smith Royal equine stomach and doas an insect growth regulator containing cyromazine, not migrate internally.can be considered. This prevents the larvae from Editor Most horses withdeveloping exoskeletons so they cannot become adults. erika963realcountry@gmail.com gastric HabronemiasisIt does not get absorbed by the horse but passes through or Draschia speciestheir digestive tract to be passed in their manure. The infestation do not show any clinical signs, and actualmaggots then ingest the cyromazine while feeding on the Misty Voitovski damage or impact to an adult horse is thought to bemanure and the immature fly will die before spreading minimal. Heavy infestation in some individuals, however,Habronema larvae. This significantly reduces the fly Creative Director has been known to cause stomach irritation and can evenpopulation in just 4 to 6 weeks.lead to perforation and possible stomach rupture. HOW TO TREAT SUMMER SORESContributing Writers The normal cycle for the worms begins when the eggsThe primary goals of treatment are to reduce Lee AndersonJustin Legler are excreted in the manure and into the environment.inflammation in the skin to allow it to heal and to stop These embryonated or developing eggs are ingested bythe life cycle of the Habronema stomach worms. Usually, Emilio MartinezMark Melkowskithe larvae of various types of flies. House, stable, and facethe horses shed the eggs in their manure to contaminate Betsy NunnJim & Bobbi Jeen Olsonflies are all commonly associated with Habronema andthe environment. Some horses are shedders, but even a Draschia species egg development since these flies startwormed horse can get summer sores. This is because the Bill RobertsAlan Rockman as larvae in manure piles. Fly larvae grow and develop,larvae that cause the massive inflammatory reaction are Bob RoloffJohn Samsill and the adult flies serve as both incubators and carriers,already dead. It is the bodys immune response to the allowing the stomach worm eggs to develop into moredead larvae that cause the intense itchiness and summer Hank ShefferBuddy Uldrikson advanced larval stages inside the flies that then transportsore formation.Michele Wilson them to re-enter the horse. When these infected flies land near a horse\'s lips, the larvae are released and swallowedCorticosteroids reduce the inflammatory hypersensitivity by the horse, completing their life cycle. reaction, and antimicrobials treat secondary infections, usually a result of self-inflicted biting, rubbing, and 801 W. Wickenburg Way This is the time of year (late summer and early fall) whenitching. Resistant lesions may require extensive surgical Wickenburg, AZ 85390 we see a lot of summer sores around horses\' eyes, on theirdebridement to adequately remove degenerative larvae lips, the external genitalia of geldings and stallions, orwithin the tissue.(602) 254-6644 developing wherever a horse has cuts or abrasions. AreasDouble dose with ivermectin, at two-week intervals until on the limbs, especially from the fetlock to the coronary band, are frequently prone to mild cuts, scrapes, andsore is gone. Treatment usually includes larvicidal, anti-ArizonaRealCountry.com trauma and thus can also be susceptible to summer sores.inflammatory, and antimicrobial components. Ivermectin Parasites like ticks and flies also can irritate the horse,has commonly been used to kill both the adult worms and the animal\'s subsequent rubbing and scratching canin the stomach and the larval forms in the skin tissue. damage skin, allowing entry to Habronema or DraschiaA single dose of ivermectin is generally sufficient to species larvae. kill Habronema species larvae. But some horses don\'t respond or they become reinfected, necessitating These "out of place" larvae cannot grow into adultmultiple doses.worms in these locations but can induce a severe local Follow Arizona Realinflammatory reaction characterized by intense swelling,Any granules and proud flesh should be debrided and ulceration, redness, and itching. They typically start outremoved, and a topical lotion to kill the larvae and reduce Country for news, events,looking pretty innocuous, but will later become large,inflammation should be applied. You can use a mixture open sores. These lesions tend to grow rapidly andof ivermectin paste, dexamethasone, hydrocortisone, giveaways and more! usually cause horse owners to seek veterinary adviceDMSO, and Wonder Dust (to create a "scab" over the within a few days. wound).SWAT fly repellent ointment also works well. Wrap if possible, and change daily.Arizona Real Country is owned andVarious skin tumors, such as sarcoid or squamous published by Barna Broadcastingcell carcinomas, can also look like summer sores.If the sore can\'t be wrapped, try to figure out a way to LLC. No person, organization or partyAlso included on the differential diagnosis list wouldkeep it covered. A belly band can be made out of towels be various fungal skin infections, foreign bodypatterned off the colic belly bands used in aftercare for can copy or reproduce the contentgranulomatous reactions and pythiosis. colic surgery. For the face, keep a fly mask on. If the fly on our website and/or magazine ormask doesn\'t cover adequately figure out some way to any part of this publication withoutThe classic summer sore is usually a firm, sometimesextend it and for ones on the legs use vet wrap. a written consent from the editorsround reaction in the skin that produces proud flesh and panel and the author of the content, aswill often contain hard, small, yellow granules. The soresCryotherapy has also proven successful in some cases. applicable. The publisher, authors andcan be very small in the early stages or can create veryThis involves the freezing of summer sores with liquid large proud flesh reactions. nitrogen. In the event of stubborn resistant summer contributors reserve their rights withsores, the answer is often surgery. regards to copyright of their work. PREVENTIONFly control, manure removal and the quick andIf you see lesions like these on your horse, please call appropriate treatment of skin wounds and infections canyour veterinarian for evaluation and treatment. greatly reduce the incidence and severity of summer sores.ArizonaRealCountry.com August 2020 5'