Penicillin susceptibility of Streptococcus pneumoniae in a private pediatric hospital in Houston, Texas

Of 493 isolates of Streptococcus pneumoniae, 14 were found to have decreased penicillin susceptibility as determined by the oxacillin disk test. Of these 14 isolates, 4 were relatively resistant by quantitative susceptibility studies and 1 was penicillin resistant (MIC, 2 micrograms/ml). This is the first confirmed penicillin-resistant isolate in the Houston, Tex., area.