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Daily News

07.12.09

Escherichia coli mastitis in cattle being treated for Staphylococcus aureus intramammary infection

Six of 23 Holstein cattle enrolled in a trial to evaluate the efficacy of extended intramammary therapy plus vaccination for subclinical Staphylococcus aureus mastitis versus intramammary therapy alone succumbed to acute or peracute mastitis before the end of the trial. Cattle were aseptically treated in all four quarters daily for six days with pirlimycin; half of these cows were also vaccinated with a S. aureus bacterin. Twelve quarters exhibited signs of mastitis and most cows were systemically affected. E. coli was isolated from the affected quarters but not from the treatment tubes so product contamination was not a concern. Clinical mastitis was likely a result of ascending E. coli infection that was not controlled by this narrow-spectrum antibiotic.

Ressources

Middleton, JR and CD Luby. 2008. Escherichia coli mastitis in cattle being treated for Staphylococcus aureus intramammary infection. Vet Rec. 162:156-157.