Fig. 2

Representative agarose-gel images. a A representative agarose-gel image of PCR-amplified 16S rDNA. The number of specimens regarded as positive are shown in bold. PCR reaction of the negative control sample was performed without any DNA extracted from catheter specimen. The bands around 100 to 200 bp are considered to be primer dimers. b A representative agarose-gel image of index PCR products. The minor band, presumably due to nonspecific amplification, is indicated by an arrowhead