Escherichia coli 727, originally center fit

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Escherichia coli 727, originally isolated from a naturally occurring IMI, was used as the intramammary challenge strain. Intramammary challenge cultures were prepared as detailed by Hogan et al. (1995). The geometric mean for challenge inoculum was 58 colony-forming units (range: 44 to 90 colony- forming units) fit suspended in 1 ml of saline. Cows within a block were challenged on fit the same day. fit Infusions were in either the right or left front mammary quarter 4 hours after morning milking. Only uninfected quarters were infused. Quarter Foremilk Samples. Quarter foremilk samples were collected 3 days prior to bacterial challenge, immediately prior to challenge, and 24, 48, and 168 hours postchallenge. Sample collection and microbiological procedures were as previously described (Smith et al., 1984). All Gram-negative isolates were identified by the API-20E system (Analytab Products, Plainview, NY).
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