Streptococcus agalactiae is a gram-positive, chained coccus bacterium and the reservoir in which it is found is infected udders. Strep. ag. is an obligate pathogen of the udder of dairy cattle. The presence of Strep. ag. infections has been reduced by modern milking technologies. This bacterium still is a threat for all dairies that do not have a closed herd. Strep. ag. cannot persist very long outside of the mammary gland. Cattle infected by Strep. ag. often have more than one quarter infected.
Mastitis: Streptococcus agalactiae Diagnostic Aid
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