| resistance to bacitracin in streptococcus pyogenes from oropharyngeal colonization and noninvasive infections in portugal was caused by two clones of distinct virulence genotypes. | during 2000-2007 in lisbon, we identified 45 bacitracin-resistant streptococcus pyogenes isolates among 1629 isolates: 24 from oropharyngeal healthy carriers (out of 1026), 21 from patients with noninvasive infections (out of 559) and zero from invasive infections (out of 44). forty-four of those isolates, mainly of colonization, are low-level bacitracin-resistant members of the cmls(b)-macrolide-resistant and tetracycline-susceptible emm28/st52 clone previously detected in europe, but only amon ... | 2009 | 19486163 |