Occurrence of the Eyeworm, Thelazia lacrymalis, in Horses in Kentucky

Et, Lyons; Jh, Drudge

doi:10.2307/3279396

Cited by 11 publications

(3 citation statements)

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“…The first report of a horse in North America infected with T lacrymalis was in Maryland in 1966 (Walker and Beckland 1971). Other reports confirm the widespread distribution of T lacrymalis throughout North America (Barker 1970;Gelatt 1972;Grant, Slatter and Dunlap 1973;Lyons and Drudge 1975;Frechette, Marcoux and St Pierre 1976). One of the authors (CPM) has observed Thelazia species as an incidental finding in horses from Missouri and Kansas.…”

Section: Thelaziasismentioning

confidence: 71%

Equine ocular parasites: A review

Moore

Sarazan²,

Whitley

et al. 1983

Equine Veterinary Journal

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Section: Thelaziasismentioning

confidence: 71%

Equine ocular parasites: A review

Moore

Sarazan²,

Whitley

et al. 1983

Equine Veterinary Journal

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“…Fibrinous tracts: 0=no tracts, 1=less than 3 visible, 2=moderate amount of tracts, but some clear areas, 3= numerous tracts, 4=extensive tracts throughout the abdominal aorta Celiac Artery: 0=no lesions, 1=small pocket with some reaction, 2= small pocket with active infl ammation and larvae present CMA, main: 0=no lesions, 1=small pocket with some reaction, 2= small pocket with active infl ammation and larvae present, 3= medium-sized aneurysm (3-8 cm long) with larvae and chronic-active infl ammation, 4=Large aneurysm (>8 cm) with larvae and chronic-active infl ammation CMA, minor: 0=no lesions, 1=small pocket with some reaction, 2= small pocket with active infl ammation and larvae present, 3=more than one small pocket with active infl ammation and larvae present Supplementary The prevalence and number of T. lacrymalis per foal were much lower than in the last study. Possibly there were less face fl ies (Musca autumnalis), the intermediate host (Lyons & Drudge 1975), to infect the 2013 foals because dairy cattle are no longer located near the foals like in previous studies. Although cattle typically are not infected with T.lacrymalis, they are a favorite host for feeding of adult face fl ies and cattle feces are ideal for fl y development.…”

Section: Discussionmentioning

confidence: 99%

“…Horses in surrounding fi elds to Field 10 have been treated routinely (3 or 4 times per year) with ivermectin since 1990. Methods for necropsy and recovery of internal parasites of the foals and determining fecal egg counts (EPG) and larval counts (LPG) per gram of feces were as described previously (Drudge et al, 1963;Lyons & Drudge, 1975;Lyons et al, 1976Lyons et al, , 1981Lyons et al, , 1983Lyons et al, , 1994. For instance fecal egg counts were determined using a sucrose fl otation method with a sensitivity of 10 eggs/gram of feces.…”

Section: Methodsmentioning

confidence: 99%

Transmission of some species of internal parasites in horse foals born in 2013 in the same pasture on a farm in Central Kentucky

et al. 2015

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SummaryThe present research is a continuation of studies conducted periodically over 40 years on transmission of natural infections of internal parasites in the same horse herd on pasture (Field 10) on a farm in Central Kentucky. It included 12 mixed light horse foals born in 2013 and euthanatized between July, 2013 and April, 2014 for collection of internal parasites. Parasites found: Gasterophilus intestinalis, Strongyloides westeri, Parascaris equorum, Anoplocephala perfoliata, small strongyles (cyathostomes), Strongylus vulgaris, Strongylus edentatus and Thelazia lacrymalis. Prevalence generally was related to age of the foals. Overall prevalence and number of specimens were lower than in earlier studies except for P. equorum. There were 15 species (much fewer than previously) of small strongyles found and recorded by location in the large intestines. All stages of small strongyles encysted in the mucosa of the large intestine were recovered by artifi cial digestion and in signifi cantly lower numbers in older foals.

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Transmission of some species of internal parasites in horses born in 1990, 1991, and 1992 in the same pasture on a farm in central Kentucky

Lyons¹,

Tolliver²,

Stamper³

et al. 1994

Veterinary Parasitology

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Studies were conducted on transmission of natural infections of several species of internal parasites in horses born and kept on the same pasture on a farm in central Kentucky. Data for the first year (1989) of a 4 year study on this farm have been published recently. The present research represents the second (1990), third (1991), and fourth (1992) years of the investigation. The number of animals (n = 28) examined varied from eight born in 1990 to ten each born in 1991 and 1992. For each year, examination was made of one horse per month, beginning in June of the year of birth and extending through January (1990) or March (1991 and 1992) the following year. Ages of the horses at necropsy ranged from 87 to 251 days. Major parasites present and months of recovery were: bots--Gasterophilus intestinalis in the mouth September-January and in the stomach August-March; stomach worms--Trichostrongylus axei in August and November, Habronema spp. (immature) in July-November and January, and Habronema muscae in October, January, and February; ascarids--Parascaris equorum in the small intestine and lungs all months; intestinal threadworms--Strongyloides westeri in all months except February; large strongyles--Strongylus vulgaris in the large intestine in all months except July and August and in the cranial mesenteric artery in all months, and Strongylus edentatus in the large intestine in January and in the ventral abdominal wall in all months; pinworms--Oxyuris equi in June and January-March; tapeworms--Anoplocephala perfoliata in August-October and December-March; and eyeworms--Thelazia lacrymalis August-February. Yearly differences and similarities of infections in the horses are discussed. The value of this type of research is mentioned.

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Occurrence of the Eyeworm, Thelazia lacrymalis, in Horses in Kentucky

Cited by 11 publications

References 0 publications

Equine ocular parasites: A review

Equine ocular parasites: A review

Transmission of some species of internal parasites in horse foals born in 2013 in the same pasture on a farm in Central Kentucky

Transmission of some species of internal parasites in horses born in 1990, 1991, and 1992 in the same pasture on a farm in central Kentucky

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