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Intramammary growth of E. coli and S. aureus following experimental challenge. Following intramammary infusion of eight quarters with 72 CFU of E. coli or eight quarters with 74 CFU of S. aureus, sterile milk samples were collected from all infused quarters at various times and plated. (A) Number of quarters in which viable bacteria were recovered. (B) Means (± standard error) of log10 CFU per milliliter in those quarters where bacteria were recovered.
