| prevalence and drug susceptibility of pathogens causing bloodstream infections in northern italy: a two-year study in 16 hospitals. | the epidemiology of bacterial pathogens causing bloodstream infection was studied in 16 hospitals in lombardy (northern italy) over a 2-year period (1999 and 2000). overall, 2924 microorganisms causing significant bacteremia were collected. the most frequent isolates were escherichia coli ( n=663; 22.7%), staphylococcus aureus ( n=534; 18.3%), staphylococcus epidermidis ( n=242; 8.2%), and pseudomonas aeruginosa ( n=176; 6.0%). unlike escherichia coli, which was usually acquired from the communi ... | 2002 | 12525919 |