SCCmec types and pvl gene in methicillin-resistant Staphylococcus aureus strains from children hospitalized in a tertiary care hospital in Mexico.

Eunice Mireya Borbón-Esquer, Alberto Villaseñor-Sierra, Erika Martínez-López, Juan José Jáuregui-Lomeli, Rosa Villaseñor-Martínez, Mariana Del Rocío Ruiz-Briseño
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引用次数: 7

Abstract

Background: The aim of this study was to determine the prevalence, SCCmec types, presence of the Panton-Valentine leukocidin (PVL) gene, and susceptibility to antibiotics of methicillin-resistant Staphylococcus aureus (MRSA) strains isolated from hospitalized children.

Methods: From August 2009 to September 2011, 291 S. aureus strains were isolated from normally sterile body sites, of which 190 (65%) were MRSA. One hundred and two of the MRSA strains were genetically evaluated. SCCmec genotypes were identified by M-PCR and the PVL gene (pvl) by end-point PCR. Resistance to erythromycin, rifampicin, clindamycin, and trimethoprim-sulfamethoxazole (SXT) was assessed by Kirby-Bauer disk diffusion method in accordance with the Clinical and Laboratory Standards Institute guidelines of 2012.

Results: Of the 102 strains evaluated, 97 (95%) were SCCmec type II, 5 (5%) were SCCmec type IVa, and all (100%) were pvl-negative. Resistance to erythromycin, clindamycin, rifampicin, and SXT was 97%, 95%, 0%, and 0%, respectively.

Conclusions: The prevalence of hospital-acquired MRSA was high. SCCmec type II was predominant and the pvl gene appeared not to play any role in the virulence of the MRSA strains from hospitalized children.

墨西哥一家三级医院住院儿童的耐甲氧西林金黄色葡萄球菌SCCmec类型和pvl基因
背景:本研究旨在了解住院儿童耐甲氧西林金黄色葡萄球菌(MRSA)的流行情况、SCCmec类型、pton - valentine leukocidin (PVL)基因的存在以及对抗生素的敏感性。方法:2009年8月~ 2011年9月,从正常无菌体表分离金黄色葡萄球菌291株,其中MRSA 190株(65%)。对102株MRSA菌株进行了遗传评估。用M-PCR和终点PCR分别鉴定SCCmec基因型和PVL基因(PVL)。采用Kirby-Bauer盘片扩散法评估红霉素、利福平、克林霉素和甲氧苄啶-磺胺甲恶唑(SXT)的耐药性,并参照2012年临床与实验室标准学会指南。结果:102株检测菌株中,SCCmecⅱ型97株(95%),SCCmec IVa型5株(5%),pvl阴性(100%)。对红霉素、克林霉素、利福平和SXT的耐药率分别为97%、95%、0%和0%。结论:医院获得性MRSA感染率较高。SCCmec II型占主导地位,pvl基因在住院儿童MRSA菌株的毒力中似乎没有任何作用。
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