TABLE 1.

Comparison of PCR versus PFGE typing resultsa

PCR round and resultNo of strains tested by PFGE
PositiveNegative
First
    Positive329
    Negative1222
Second
    Positive3511
    Negative621
  • a Strains typed by both PFGE and PCR (+/+ strains) were clustered together by PFGE and PCR. Strains typed by neither method (−/− strains) were unrelated by PFGE and PCR. The +/− or −/+ strains were clustered together by PFGE but not by PCR or by PCR but not by PFGE as indicated. In the PCR second run, two strains were not typeable.