Polyacrylamide gel electrophoresis (SDS-PAGE) analysis of broad range 16S rRNA gene PCR products obtained from blood samples. Lane 1, marker, 100 bp DNA ladder (Roche DNA Marker XIV); lane 2, positive control, Escherichia coli; following lanes, PCR products obtained from blood specimens arranged by date of collection. For each specimen PCR products are shown obtained with undiluted (0) and 5×-diluted (5) DNA extracts. The 2 last negative samples are not shown.