Figure 1. Prevalence of susceptibility to five antimicrobial agents for Streptococcus pneumoniae isolates at the National Taiwan University Hospital, 1981–2001. Susceptibility testing was performed with the disk diffusion method. For penicillin susceptibility testing, the 10-U penicillin disk was used from 1981 to 1989, and the 1-μg oxacillin disk since 1990.
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