Heteroresistance to penicillin in Streptococcus pneumoniae

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Fig. 1.
Fig. 1.

Characteristics of heteroresistant S. pneumoniae strains in the penicillin Etest. (A) Typical example of the zone phenomenon observed in the penicillin Etest for some S. pneumoniae strains with heteroresistance to penicillin (see also Table 2). The black arrow indicates the end of the bacterial lawn, and the white arrow points to the end of the hemolysis zone. (B) Satellite colonies observed in the penicillin Etest for some S. pneumoniae strains with heteroresistance to penicillin.


This Article

  1. Published online before print August 17, 2007, doi: 10.1073/pnas.0702377104 PNAS August 28, 2007 vol. 104 no. 35 14098-14103
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