Cutaneous and ocular habronemiasis in horses

63 Cases (1988-2002)

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52 Citations (Scopus)

Abstract

Objective - To describe clinical manifestations of cutaneous and ocular habronemiasis in horses and evaluate outcome of treatment. Design - Retrospective study. Animals - 63 horses. Procedure - The diagnosis was made on the basis of history, clinical signs, and identification of calcified concretions (sulfur granules) in lesions. Histologic examination of biopsy specimens was used to confirm the diagnosis. Case horses were compared with a control population of 12,720 horses examined during the same period. Results - Arabians, gray horses, and horses with diluted coat colors were overrepresented; Thoroughbreds were underrepresented. Lesions were identified most often during the summer and early fall. The medial canthus of the eye, male genitalia, third eyelid, and distal portions of the extremities were the most commonly affected locations. Twenty-five lesions were biopsied, and results of histologic examination were consistent with a diagnosis of habronemiasis. However, nematode larvae were seen in only 11 (44%) biopsy specimens. Treatment consisted of surgical removal (7 horses) or medical treatment (56) consisting of debulking granulation tissue and topical, intralesional, or systemic treatment with corticosteroids. All horses were treated with ivermectin. Conclusions and Clinical Relevance - Results suggest that cutaneous and ocular habronemiasis should be considered when examining a horse during the summer months with a proliferative, moist, granulomatous lesion. Treatment should be aimed at decreasing the size of the lesion, reducing inflammation, and preventing recurrence. In general, the prognosis was good, and healing occurred within a few weeks. Fly control and regular deworming with ivermectin are recommended to reduce the incidence of habronemiasis.

Original languageEnglish (US)
Pages (from-to)978-982
Number of pages5
JournalJournal of the American Veterinary Medical Association
Volume222
Issue number7
DOIs
StatePublished - Apr 1 2003

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Spirurida Infections
Horses
eyes
horses
Skin
lesions (animal)
Ivermectin
ivermectin
biopsy
Arabian (horse breed)
Nictitating Membrane
Male Genitalia
deworming
Biopsy
granulation tissue
Lacrimal Apparatus
eyelids
Granulation Tissue
medical treatment
nematode larvae

ASJC Scopus subject areas

  • veterinary(all)

Cite this

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title = "Cutaneous and ocular habronemiasis in horses: 63 Cases (1988-2002)",
abstract = "Objective - To describe clinical manifestations of cutaneous and ocular habronemiasis in horses and evaluate outcome of treatment. Design - Retrospective study. Animals - 63 horses. Procedure - The diagnosis was made on the basis of history, clinical signs, and identification of calcified concretions (sulfur granules) in lesions. Histologic examination of biopsy specimens was used to confirm the diagnosis. Case horses were compared with a control population of 12,720 horses examined during the same period. Results - Arabians, gray horses, and horses with diluted coat colors were overrepresented; Thoroughbreds were underrepresented. Lesions were identified most often during the summer and early fall. The medial canthus of the eye, male genitalia, third eyelid, and distal portions of the extremities were the most commonly affected locations. Twenty-five lesions were biopsied, and results of histologic examination were consistent with a diagnosis of habronemiasis. However, nematode larvae were seen in only 11 (44{\%}) biopsy specimens. Treatment consisted of surgical removal (7 horses) or medical treatment (56) consisting of debulking granulation tissue and topical, intralesional, or systemic treatment with corticosteroids. All horses were treated with ivermectin. Conclusions and Clinical Relevance - Results suggest that cutaneous and ocular habronemiasis should be considered when examining a horse during the summer months with a proliferative, moist, granulomatous lesion. Treatment should be aimed at decreasing the size of the lesion, reducing inflammation, and preventing recurrence. In general, the prognosis was good, and healing occurred within a few weeks. Fly control and regular deworming with ivermectin are recommended to reduce the incidence of habronemiasis.",
author = "Nicola Pusterla and Watson, {Johanna L} and Wilson, {William D} and Affolter, {Verena K} and Sharon Spier",
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T1 - Cutaneous and ocular habronemiasis in horses

T2 - 63 Cases (1988-2002)

AU - Pusterla, Nicola

AU - Watson, Johanna L

AU - Wilson, William D

AU - Affolter, Verena K

AU - Spier, Sharon

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N2 - Objective - To describe clinical manifestations of cutaneous and ocular habronemiasis in horses and evaluate outcome of treatment. Design - Retrospective study. Animals - 63 horses. Procedure - The diagnosis was made on the basis of history, clinical signs, and identification of calcified concretions (sulfur granules) in lesions. Histologic examination of biopsy specimens was used to confirm the diagnosis. Case horses were compared with a control population of 12,720 horses examined during the same period. Results - Arabians, gray horses, and horses with diluted coat colors were overrepresented; Thoroughbreds were underrepresented. Lesions were identified most often during the summer and early fall. The medial canthus of the eye, male genitalia, third eyelid, and distal portions of the extremities were the most commonly affected locations. Twenty-five lesions were biopsied, and results of histologic examination were consistent with a diagnosis of habronemiasis. However, nematode larvae were seen in only 11 (44%) biopsy specimens. Treatment consisted of surgical removal (7 horses) or medical treatment (56) consisting of debulking granulation tissue and topical, intralesional, or systemic treatment with corticosteroids. All horses were treated with ivermectin. Conclusions and Clinical Relevance - Results suggest that cutaneous and ocular habronemiasis should be considered when examining a horse during the summer months with a proliferative, moist, granulomatous lesion. Treatment should be aimed at decreasing the size of the lesion, reducing inflammation, and preventing recurrence. In general, the prognosis was good, and healing occurred within a few weeks. Fly control and regular deworming with ivermectin are recommended to reduce the incidence of habronemiasis.

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