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Effects of Corynebacterium bovis Infection on Susceptibility to Major Mastitis Pathogens

Louisiana State University Agricultural Center, Louisiana Agriculture Experiment Station, Hill Farm Research Station, Homer 71040

ABSTRACT

Experimental challenge procedures were used to study infectivity and virulence of Cornebacterium bovis. Challenge procedures using Stapbylococcus aureus (Newbould 305) and Streptococcus agalactiae (McDonald 44) were used to study effects of Cornebacterium bovis infections on superinfection with major pathogens.

Rate of infection under experimental challenge conditions was significantly greater with Cornebacterium bovis than previously observed for Stapbylococcus aureus or Streptococcus agalactiae. Principal location of Corynebacterium bovis colonization appeared to the teat canal region, although the organism was isolated from 75% of the teat cisterns by puncture technique. Quarters with Corynebacterium bovis infections were more resistant to infection by Stapbylococcus aureus than bacteriologically negative quarters. Quarters infected with Corynebacterium bovis were approximately 8.5-fold more susceptible to Streptococcus agalactiae infection than negative quarters. Somatic cell counts were doubled in negative quarters that developed Corynebacterium bovis infections; the geometric mean was 2.4 x 10⁵.

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