[Streptococcus agalactiae].

Source / Transmission Strep agalactiae is a contagious pathogen. Intramammary infections occur primarily during milking, when milk from an infected cow comes into contact with the teat end of an uninfected cow. The infection is spread by contaminated milk on milking equipment, towels or milker’s hands. Heifers may become infected as calves due to cross-sucking in herds where non-pastuerized waste milk containing Strep agalactiae is fed. These heifers may freshen with blind or infected quarters.