Journal of Antimicrobial Chemotherapy (2001) 47, 863-866
© 2001 The British Society for Antimicrobial Chemotherapy
Distribution of resistance genes tet(M), aph3'-III, catpC194 and the integrase gene of Tn1545 in clinical Streptococcus pneumoniae harbouring erm(B) and mef(A) genes in Spain
Department of Microbiology, University Hospital Lozano Blesa, San Juan Bosco 15, 50009 Zaragoza, Spain
The most prevalent macrolide resistance phenotype and genotype among pneumococcal isolates was the cMLSB phenotype [erm(B) or erm(B)/mef(A)] (91.3%). We studied the distribution of other resistance genes, tet(M), catpC194, aph3'-III, in these strains, seeing evolution at work in that some strains carried different combinations of resistance determinants. The most prevalent patterns associated with resistance to erythromycin [erm(B)] were resistance to tetracycline [tet(M)] and chloramphenicol (catpC194) (48.2%) or resistance to tetracycline [tet(M)] alone (42.2%). In our isolates of Streptococcus pneumoniae there was a strong association of the erm(B) and tet(M) genes with Tn1545-related elements.
* Corresponding author. Tel: +34-976-556400; E-mail: c.seral.000{at}recol.es
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