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Table 1 Where to target antimicrobial therapy in clinical mastitis due to different pathogens [9]

From: Treatment of mastitis during lactation

  Milk/ducts Udder tissue Cow
Streptococcus agalactiae +++ --- ---
Other streptococci +++ + ---
Staphylococcus aureus + +++ ---
Coagulase-negative staphylococci +++ --- ---
Arcanobacterium pyogenes (summer mastitis) --- ++ +++
Coliforms + -- +++