FIG 4.
Results of RT-PCR assays for the discrimination of H. haemolyticus versus H. influenzae strains. (A) Four possible results for combined purT and hpd RT-PCR assays are evaluated: purT+/hpd, purT/hpd+, purT+/hpd+, and purT/hpd. The numbers of H. haemolyticus (red) and H. influenzae (blue) strains with each combination are shown. (B) Sensitivity and specificity values for discrimination of H. haemolyticus and H. influenzae based on purT or hpd RT-PCR assays alone compared to combined RT-PCR assays for H. haemolyticus (purT+/hpd) and H. influenzae (purT/hpd+).