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Journal of Dairy Science Vol. 73 No. 12 3457-3462
© 1990 by American Dairy Science Association ®
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Protective Effect of Staphylococcus chromogenes Infection Against Staphylococcus aureus Infection in the Lactating Bovine Mammary Gland

K. R. Matthews 1, R. J. Harmon 1, and B. A. Smith 1

1 Department of Animal Sciences, University of Kentucky, Lexington 40546-4215

The susceptibility of uninfected or Staphylococcus chromogenes-infected quarters to challenge with Staphylococcus aureus was measured. Seventeen S. chromogenes -infected quarters were challenged by infusion of S. aureus into the teat sinus; 47% (8 of 17) became infected and all 18 uninfected quarters challenged similarly with S. aureus became infected. No differences in daily milk yield were seen between uninfected quarters and S. chromogenes-infected quarters prior to S. aureus infusion. Postinfusion, milk yield for S. aureus-infected, S. chromogenes-infected, and S. chromogenes- and S. aureus-infected quarters differed.

Somatic cell counts were elevated in S. chromogenes-infected quarters compared with uninfected quarters prior to S. aureus infusion. Somatic cell counts were not different between S. aureus- and S. chromogenes- and S. aureus-infected quarters postinfusion, but were different for S. chromogenes-infected quarters. Chloride concentrations in S. chromogenes-and S. aureus-infected quarters were different from either S. aureus-infected or S. chromogenes-infected quarters. Staphylococcus aureus colony forming units in quarters with preexisting S. chromogenes infections were lower than S. aureus colony-forming units in previously uninfected quarters. Possible protective mechanisms induced by S. chromogenes against superinfection by S. aureus are discussed.

Key Words: Staphylococcus aureus • mastitis • bovine

Submitted on June 12, 1989
Accepted on July 18, 1990




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