Mammary botryomycosis: two concomitant cases in mares: case report

Abstract

Mammary disorders in mares are rare and usually only one animal per paddock is affected. In this report, two mares with 7 and 9 years old, were concomitantly diagnosis of chronic pyogranulomatous mastitis, associated with the Splendore-Hoeppli reaction, indicative of botryomycosis a rare, chronic suppurative disease with microabscess formation, characterized by in vivo formation of eosinophilic materials around microorganisms or biologically inert material. Various bacteria can cause botryomycosis in horses, and the most frequently isolated one is Staphylococcus sp., particularly S. aureus. This report confirms the role of Staphylococcus sp.; however, specifically S. hyicus and S. cohnii that prior to the current report, had not been associated with cases of botryomycosis.Keywords: equine, mastitis, mammary gland, botryomycosis RESUMO Enfermidades mamárias em éguas são raras e, normalmente, apenas um animal é afetado. Neste relato, duas éguas, de sete e nove anos, foram diagnosticadas concomitantemente com mastite crônica piogranulomatosa, associada com reação de

Mammary botryomycosis and hemimastectomy in a post‐partum Welsh Pony mare

“…2012; Belli et al . 2018). Common to these and to our report is the development of abscesses that fail to resolve after administering antimicrobial treatment, necessitating mastectomy or hemimastectomy.…”

“…2012; Belli et al . 2018). In the majority of the cases, hemimastectomy was performed after unsuccessful antimicrobial treatment, and no follow‐up information was provided describing the ability of the operated mares to produce enough milk to meet the demands of the offspring.…”

Development and Pathology of the Equine Mammary Gland

“…Mammary infection with Staphylococcus spp. may elicit granulomatous inflammation, with a very distinctive pattern of response to the bacteria known as botryomycosis [93,112].…”