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Survival curves for acute mastitis caused by Klebsiella pneumoniae and Escherichia coli. Survival was significantly shorter in dairy cows with acute mastitis caused by K. pneumoniae compared with E. coli (P=0.000148; K. pneumoniae: median survival, 76 days; 95% lower confidence limit, 34 days; 95% upper confidence limit, 230 days; E. coli, median survival, 464 days; 95% lower confidence limit, 409 days; 95% upper confidence limit, 618 days.
