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Meticillin-resistant Staphylococcus aureus with a novel mecA homologue in human and bovine populations in the UK and Denmark: a descriptive study
BACKGROUND: Animals can act as a reservoir and source for the emergence of novel meticillin-resistant Staphylococcus aureus (MRSA) clones in human beings. Here, we report the discovery of a strain of S aureus (LGA251) isolated from bulk milk that was phenotypically resistant to meticillin but tested...
Autores principales: | , , , , , , , , , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Elsevier Science ;, The Lancet Pub. Group
2011
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3829197/ https://www.ncbi.nlm.nih.gov/pubmed/21641281 http://dx.doi.org/10.1016/S1473-3099(11)70126-8 |
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author | García-Álvarez, Laura Holden, Matthew TG Lindsay, Heather Webb, Cerian R Brown, Derek FJ Curran, Martin D Walpole, Enid Brooks, Karen Pickard, Derek J Teale, Christopher Parkhill, Julian Bentley, Stephen D Edwards, Giles F Girvan, E Kirsty Kearns, Angela M Pichon, Bruno Hill, Robert LR Larsen, Anders Rhod Skov, Robert L Peacock, Sharon J Maskell, Duncan J Holmes, Mark A |
author_facet | García-Álvarez, Laura Holden, Matthew TG Lindsay, Heather Webb, Cerian R Brown, Derek FJ Curran, Martin D Walpole, Enid Brooks, Karen Pickard, Derek J Teale, Christopher Parkhill, Julian Bentley, Stephen D Edwards, Giles F Girvan, E Kirsty Kearns, Angela M Pichon, Bruno Hill, Robert LR Larsen, Anders Rhod Skov, Robert L Peacock, Sharon J Maskell, Duncan J Holmes, Mark A |
author_sort | García-Álvarez, Laura |
collection | PubMed |
description | BACKGROUND: Animals can act as a reservoir and source for the emergence of novel meticillin-resistant Staphylococcus aureus (MRSA) clones in human beings. Here, we report the discovery of a strain of S aureus (LGA251) isolated from bulk milk that was phenotypically resistant to meticillin but tested negative for the mecA gene and a preliminary investigation of the extent to which such strains are present in bovine and human populations. METHODS: Isolates of bovine MRSA were obtained from the Veterinary Laboratories Agency in the UK, and isolates of human MRSA were obtained from diagnostic or reference laboratories (two in the UK and one in Denmark). From these collections, we searched for mecA PCR-negative bovine and human S aureus isolates showing phenotypic meticillin resistance. We used whole-genome sequencing to establish the genetic basis for the observed antibiotic resistance. FINDINGS: A divergent mecA homologue (mecA(LGA251)) was discovered in the LGA251 genome located in a novel staphylococcal cassette chromosome mec element, designated type-XI SCCmec. The mecA(LGA251) was 70% identical to S aureus mecA homologues and was initially detected in 15 S aureus isolates from dairy cattle in England. These isolates were from three different multilocus sequence type lineages (CC130, CC705, and ST425); spa type t843 (associated with CC130) was identified in 60% of bovine isolates. When human mecA-negative MRSA isolates were tested, the mecA(LGA251) homologue was identified in 12 of 16 isolates from Scotland, 15 of 26 from England, and 24 of 32 from Denmark. As in cows, t843 was the most common spa type detected in human beings. INTERPRETATION: Although routine culture and antimicrobial susceptibility testing will identify S aureus isolates with this novel mecA homologue as meticillin resistant, present confirmatory methods will not identify them as MRSA. New diagnostic guidelines for the detection of MRSA should consider the inclusion of tests for mecA(LGA251). FUNDING: Department for Environment, Food and Rural Affairs, Higher Education Funding Council for England, Isaac Newton Trust (University of Cambridge), and the Wellcome Trust. |
format | Online Article Text |
id | pubmed-3829197 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2011 |
publisher | Elsevier Science ;, The Lancet Pub. Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-38291972013-11-15 Meticillin-resistant Staphylococcus aureus with a novel mecA homologue in human and bovine populations in the UK and Denmark: a descriptive study García-Álvarez, Laura Holden, Matthew TG Lindsay, Heather Webb, Cerian R Brown, Derek FJ Curran, Martin D Walpole, Enid Brooks, Karen Pickard, Derek J Teale, Christopher Parkhill, Julian Bentley, Stephen D Edwards, Giles F Girvan, E Kirsty Kearns, Angela M Pichon, Bruno Hill, Robert LR Larsen, Anders Rhod Skov, Robert L Peacock, Sharon J Maskell, Duncan J Holmes, Mark A Lancet Infect Dis Fast track — Articles BACKGROUND: Animals can act as a reservoir and source for the emergence of novel meticillin-resistant Staphylococcus aureus (MRSA) clones in human beings. Here, we report the discovery of a strain of S aureus (LGA251) isolated from bulk milk that was phenotypically resistant to meticillin but tested negative for the mecA gene and a preliminary investigation of the extent to which such strains are present in bovine and human populations. METHODS: Isolates of bovine MRSA were obtained from the Veterinary Laboratories Agency in the UK, and isolates of human MRSA were obtained from diagnostic or reference laboratories (two in the UK and one in Denmark). From these collections, we searched for mecA PCR-negative bovine and human S aureus isolates showing phenotypic meticillin resistance. We used whole-genome sequencing to establish the genetic basis for the observed antibiotic resistance. FINDINGS: A divergent mecA homologue (mecA(LGA251)) was discovered in the LGA251 genome located in a novel staphylococcal cassette chromosome mec element, designated type-XI SCCmec. The mecA(LGA251) was 70% identical to S aureus mecA homologues and was initially detected in 15 S aureus isolates from dairy cattle in England. These isolates were from three different multilocus sequence type lineages (CC130, CC705, and ST425); spa type t843 (associated with CC130) was identified in 60% of bovine isolates. When human mecA-negative MRSA isolates were tested, the mecA(LGA251) homologue was identified in 12 of 16 isolates from Scotland, 15 of 26 from England, and 24 of 32 from Denmark. As in cows, t843 was the most common spa type detected in human beings. INTERPRETATION: Although routine culture and antimicrobial susceptibility testing will identify S aureus isolates with this novel mecA homologue as meticillin resistant, present confirmatory methods will not identify them as MRSA. New diagnostic guidelines for the detection of MRSA should consider the inclusion of tests for mecA(LGA251). FUNDING: Department for Environment, Food and Rural Affairs, Higher Education Funding Council for England, Isaac Newton Trust (University of Cambridge), and the Wellcome Trust. Elsevier Science ;, The Lancet Pub. Group 2011-08 /pmc/articles/PMC3829197/ /pubmed/21641281 http://dx.doi.org/10.1016/S1473-3099(11)70126-8 Text en © 2011 Elsevier Ltd. All rights reserved. https://creativecommons.org/licenses/by/4.0/This work is licensed under a Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/) , which allows reusers to distribute, remix, adapt, and build upon the material in any medium or format, so long as attribution is given to the creator. The license allows for commercial use. |
spellingShingle | Fast track — Articles García-Álvarez, Laura Holden, Matthew TG Lindsay, Heather Webb, Cerian R Brown, Derek FJ Curran, Martin D Walpole, Enid Brooks, Karen Pickard, Derek J Teale, Christopher Parkhill, Julian Bentley, Stephen D Edwards, Giles F Girvan, E Kirsty Kearns, Angela M Pichon, Bruno Hill, Robert LR Larsen, Anders Rhod Skov, Robert L Peacock, Sharon J Maskell, Duncan J Holmes, Mark A Meticillin-resistant Staphylococcus aureus with a novel mecA homologue in human and bovine populations in the UK and Denmark: a descriptive study |
title | Meticillin-resistant Staphylococcus aureus with a novel mecA homologue in human and bovine populations in the UK and Denmark: a descriptive study |
title_full | Meticillin-resistant Staphylococcus aureus with a novel mecA homologue in human and bovine populations in the UK and Denmark: a descriptive study |
title_fullStr | Meticillin-resistant Staphylococcus aureus with a novel mecA homologue in human and bovine populations in the UK and Denmark: a descriptive study |
title_full_unstemmed | Meticillin-resistant Staphylococcus aureus with a novel mecA homologue in human and bovine populations in the UK and Denmark: a descriptive study |
title_short | Meticillin-resistant Staphylococcus aureus with a novel mecA homologue in human and bovine populations in the UK and Denmark: a descriptive study |
title_sort | meticillin-resistant staphylococcus aureus with a novel meca homologue in human and bovine populations in the uk and denmark: a descriptive study |
topic | Fast track — Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3829197/ https://www.ncbi.nlm.nih.gov/pubmed/21641281 http://dx.doi.org/10.1016/S1473-3099(11)70126-8 |
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