ABSTRACT
Objective To analyze the distribution of common drug-resistance genotypes of multi-drug resistant bacteria (MDRB) in second class and below hospitals in 3 big areas of Chongqing City for perfecting the bacterial drug resistance surveillance network in local area.Methods In 7206 detected strains of MDRB, the re-cultured pure colonies of top five bacteria in the bacterial strains numer were taken and performed the common drug resistant genotyping detection and comparative analysis by PCR technique and sequencing.Results Acinetobacter spp.was dominated by the genotypes carrying TEM,SUL and GyrA genes,Klebsiella pneumoniae was dominated by the genotypes carrying SHV,GyrA genes,Escherichia coli was dominated by the genotypes carrying TEM,CTX-M,SUL,GyrA,aac (3) Ⅱ genes,Pseudomonas aeruginosa was dominated by genotypes carrying SUL,GyrA genes,Staphylococcus was dominated by genotypes carrying GyrA,aac (6 ′)-aph ′′ genes;among the five strains of MDRB,the majority were the strains with multiple expression of two kinds or four kinds of common drug-resistance genes,in which the detection rate of Escherichia coli multiple expression was highest,reaching 92.74%,the detection rate of Staphylococcus multiple expression was lower.The detection rates of common drug resistant genotypes carried by MDRB had statistical difference among various areas and various years (P<0.05);in the comparison with the gene sequences of corresponding bacteria in NCBI Blastn database,the sequencing results of 7 common drug resistant genotypes carried by 5 kinds of MDRB were basically consistent.Conclusion The common drug-resistant genotypes carried by MDRB detected in the second class and below hospitals of Chongqing City and their distribution are basically consistent with the monitoring levels in the local tertiary hospitals and whole nation.Therefore the antibacterial surveillance of infection pathogenic bacteria should be strengthened in these hospitals,and medication should be rationally used so as to delay the development of pathogenic bacterial drug resistance in local area.