Analysis of the Resistance Gene in Streptococcus pneumoniae

Abstract

Resistance genes were determinded for 81 strains of Streptococcus pneumoniae isolated from Ehime University hospital, during 2002 and 2003 by various clinical material. In penicillin-binding proteins of mutation, there were 74 strains; pbp2x mutation 23 strains (28.4%), pbp2b mutation one strain (12%), pbp1a+pbp2x mutations 5 strains (6.2%), pbp2x+pbp2b mutations 18 strains (22.2%) and all mutations 27 strains (33.3%). As for the result of macrolide resistance genes, there were 67strains; mefA gene 20 strains (24.7%), ermB gene 46 strains (56.8%) and both gene one strain (1.2%).In the analysis of gyrA gene and parC gene, 3 strains (3.7%) had both gene mutations, and 26 strains (32.1%) had only parC gene mutation. There was more of an increase than before in isolates, two or more mutation strains with PBPs gene, ermB gene holding strains and the levofloxacin resistance strain. These results suggest that the gyrA gene or parC gene mutation strains hold PBPs gene mutation and macrolide resistance genes in a high rate, and there will be more drug resistance in the future.