Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Percentage of strains exhibiting a given mutation frequency to rifampin resistance among all 200 S. pneumoniae clinical isolates studied (a) and among penicillin-susceptible (PenS), -intermediate (PenI), and -resistant (PenR) subgroups of the isolates studied. The dotted lines in panel a show mutation frequencies of R800 (hexA-proficient) and R310 (hexA-deficient) S. pneumoniae control strains.
