Figure 1. All bacterial species that were isolated from blood in >100 persons, January 1996 through March 1999, all hospitals in San Francisco County, California. Each bar is divided by yearly totals. Total number of isolates obtained during the study period is given above each bar. MRSA = methicillin-resistant Staphylococcus aureus; VRE = vancomycin-resistant Enterococcus.