Bacterial culture and susceptibility of samples taken from septic foot lesions of adult beef cattle
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Lameness is an economically important and common disease of cattle. Foot disease is the most common cause of cattle lameness; however, there are few publications regarding lameness in cow-calf operations. The objectives of this study were to describe the most commonly isolated bacteria from septic foot lesions of adult beef cattle and determine the antimicrobial susceptibility patterns of the isolated bacteria. Fifty-four cattle [greater than or equal to] 18 months of age diagnosed with a sole abscess or distal interphalangeal joint sepsis that were presented to the MU VHC from cow-calf operations were enrolled. Abscess fluid samples were cultured under aerobic and anaerobic conditions and isolates were identified using MALDI-TOF mass spectrometry or partial genome sequencing. In vitro antimicrobial susceptibility testing was performed on isolates (n = 96) when a particular species was isolated from [greater than or equal to] 5 samples. Fifty of the 54 samples were polymicrobial. Trueperella pyogenes (n=22/54) and Streptococcus uberis (16/54) were the most commonly isolated bacteria. Eighty-one of the 96 tested isolates were resistant to [greater than or equal to] 1 antimicrobial and multidrug resistance was identified in 38/96 isolates. Overall, resistance to oxytetracycline (n=50/96) and tylosin (40/96) was common while resistance to ceftiofur (5/96) was rare among all tested isolates. Septic processes of the foot in adult beef cattle are often polymicrobial and likely opportunistic in origin and antimicrobial resistance is common.