摘要
目的探讨南京市淋球菌对头孢曲松的敏感性以及相应菌株的淋球菌多抗原测序分型(NG-MAST)基因型别。方法2007年和2012年在中国疾病预防控制中心性病控制中心临床防治基地分别收集了204株和81株淋球菌,经过分离纯化及鉴定后,用琼脂稀释法测定其对头孢曲松的最小抑菌浓度(Mm);菌株培养后利用试剂盒提取DNA,并进行淋球菌多抗原测序分型(NG-MAST)。结果测试的285株淋球菌MIC≥0.060Ixg/ml的菌株比例为63.2%,MIC≥0.125Ixg/ml的比例为31.6%。2012年MIC≥0.060Ixg/ml和MIC≥0.125IXg/ml的菌株比例分别为44.4%和11.1%,2007年MIC≥0.060斗g/ml和MIC≥0.125肛∥ml的菌株比例分别为70.6%和39.7%。NG—MAST分型研究显示,285株淋球菌共有166个型别,菌株多样性较高,其中73种为已知型别,93种为新型别。2007年测定的所有菌株中以sT568(n=13),ST270(n=9),ST421(n:7),ST2288(n=5),STl731(n=4),STl766(n=4),STl866(n=4),STl870(n:4)等为主。2012年测定的所有菌株中以ST2318(n=5),STl053(n=4),ST5990(n=4),ST8726(n=4)为主。相同NG-MAST型别的菌株具有相同或相近的MIC值。结论2012年与2007年菌株的优势型别有较大变化,某些型别与头孢药敏值有较强对应关系。NG-MAST分型可能作为分子生物学标记用于淋球菌耐药监测。
Objective To test the ceftriaxone susceptibility of Neisseria gonorrboeae (NG) isolates from Nanjing city, and to assess their genotypes by using the NG muhi-antigen sequence typing (NG-MAST) method. Methods A total of 204 NG strains isolated in 2007 and 81 in 2012 from Nanjing city were included in this study. The minimum inhibitory concentration (MIC) of ceftriaxone was determined for these strains using an agar dilution method. DNA was extracted by the Qiagen commercial kit from these strains followed by NG-MAST. Results All the isolates were susceptible to ceftriaxone (MIC, ≤ 0.25 ug/ml). The MIC of ceftriaxone was≥ 0.06 ug/ml for 63.2% of all the NG strains, 70.6% of those isolated in 2007 and 44.4% of those in 2012, and /〉 0.125 ug/ml for 31.6 % of all the NG strains, 39.7% of those isolated in 2007, 11.1% of those in 2012. Totally, 166 genotypes were identified among the 285 isolates, of which, 73 had been reported, and 93 were previously unreported. The most prevalent genotype was ST568 (n = 13) in NG strains isolated in 2007, followed by ST270 (n = 9), ST421 (n = 7), ST2288 (n = 5), ST1731 (n = 4), ST1766 (n = 4), ST1866 (n = 4), ST1870 (n = 4), while ST2318 (n = 5), ST1053 (n = 4), ST5990 (n = 4), ST8726 (n = 4) were the common genotypes in 2012. Those isolates with identical or similar genotypes tended to display similar MICs for ceftriaxone. Conclusions The prevalent genotypes of NG are markedly different between 2007 and 2012 in Nanjing region, and there is a strong association between the genotypes and ceftriaxone susceptibility of NG. NG-MAST results may serve as a genetic marker in the surveillance of antibiotic susceptibility in NG.
出处
《中华皮肤科杂志》
CAS
CSCD
北大核心
2014年第5期316-319,共4页
Chinese Journal of Dermatology
基金
基金项目:国家自然科学基金青年科学基金(81101294)
协和青年基金(3332013143)
关键词
奈瑟球菌
淋病
抗药性
头孢曲松
Neisseffa gonorrhoeae
Drug resistance
Ceftriaxone