Robert B. Corbett

Lorenzo Quesnel A high percentage of cows infected with Staph aureus never become clinical. If a new infection is established in the quarter and it is not treated for several months, most cows develop abscesses in the mammary tissue. Antibiotics cannot successfully penetrate the wall of an abscess, so the majority of the cows become chronically infected. We routinely culture fresh cows to find ...

Lorenzo Quesnel Yes. For sure. When the elevated SCC is due to a systemic disease such as those you mentioned, you see an elevation in all 4 quarters. If you use a CMT test, in most cases these quarters will not be higher than a CMT score of 1.

Mohamed Fawzy Elsawy I strongly disagree. Anyone that has done a necropsy on a chronically infected quarter with Staph aureus knows that the milk may look completely normal but the mammary tissue is full of scar tissue and abscesses. Also, Pseudomonas, Prototheca, Serratia, and many other organisms cause chronically infected quarters that have normal appearing milk.