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Resolution of a Protracted Serogroup B Meningococcal Outbreak with Whole-Genome Sequencing Shows Interspecies Genetic Transfer.
Mulhall, Robert M; Brehony, Carina; O'Connor, Lois; Meyler, Kenneth; Jolley, Keith A; Bray, James; Bennett, Desiree; Maiden, Martin C J; Cunney, Robert.
Afiliação
  • Mulhall RM; Irish Meningitis and Sepsis Reference Laboratory, Temple Street Children's University Hospital, Dublin, Republic of Ireland robert.mulhall@cuh.ie.
  • Brehony C; Department of Zoology, University of Oxford, Oxford, England, United Kingdom.
  • O'Connor L; Department of Public Health, HSE East, Dr Steevens' Hospital, Dublin, Republic of Ireland.
  • Meyler K; Irish Meningitis and Sepsis Reference Laboratory, Temple Street Children's University Hospital, Dublin, Republic of Ireland.
  • Jolley KA; Department of Zoology, University of Oxford, Oxford, England, United Kingdom.
  • Bray J; Department of Zoology, University of Oxford, Oxford, England, United Kingdom.
  • Bennett D; Irish Meningitis and Sepsis Reference Laboratory, Temple Street Children's University Hospital, Dublin, Republic of Ireland.
  • Maiden MC; Department of Zoology, University of Oxford, Oxford, England, United Kingdom.
  • Cunney R; Irish Meningitis and Sepsis Reference Laboratory, Temple Street Children's University Hospital, Dublin, Republic of Ireland.
J Clin Microbiol ; 54(12): 2891-2899, 2016 12.
Article em En | MEDLINE | ID: mdl-27629899
A carriage study was undertaken (n = 112) to ascertain the prevalence of Neisseria spp. following the eighth case of invasive meningococcal disease in young children (5 to 46 months) and members of a large extended indigenous ethnic minority Traveller family (n = 123), typically associated with high-occupancy living conditions. Nested multilocus sequence typing (MLST) was employed for case specimen extracts. Isolates were genome sequenced and then were assembled de novo and deposited into the Bacterial Isolate Genome Sequencing Database (BIGSdb). This facilitated an expanded MLST approach utilizing large numbers of loci for isolate characterization and discrimination. A rare sequence type, ST-6697, predominated in disease specimens and isolates that were carried (n = 8/14), persisting for at least 44 months, likely driven by the high population density of houses (n = 67/112) and trailers (n = 45/112). Carriage for Neisseria meningitidis (P < 0.05) and Neisseria lactamica (P < 0.002) (2-sided Fisher's exact test) was more likely in the smaller, more densely populated trailers. Meningococcal carriage was highest in 24- to 39-year-olds (45%, n = 9/20). Evidence of horizontal gene transfer (HGT) was observed in four individuals cocolonized by Neisseria lactamica and Neisseria meningitidis One HGT event resulted in the acquisition of 26 consecutive N. lactamica alleles. This study demonstrates how housing density can drive meningococcal transmission and carriage, which likely facilitated the persistence of ST-6697 and prolonged the outbreak. Whole-genome MLST effectively distinguished between highly similar outbreak strain isolates, including those isolated from person-to-person transmission, and also highlighted how a few HGT events can distort the true phylogenetic relationship between highly similar clonal isolates.
Assuntos

Texto completo: 1 Coleções: 01-internacional Contexto em Saúde: 3_ND Base de dados: MEDLINE Assunto principal: Surtos de Doenças / Densidade Demográfica / Neisseria meningitidis Sorogrupo B / Neisseria lactamica / Infecções Meningocócicas Tipo de estudo: Risk_factors_studies Limite: Adolescent / Adult / Child / Child, preschool / Humans / Infant Idioma: En Revista: J Clin Microbiol Ano de publicação: 2016 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Contexto em Saúde: 3_ND Base de dados: MEDLINE Assunto principal: Surtos de Doenças / Densidade Demográfica / Neisseria meningitidis Sorogrupo B / Neisseria lactamica / Infecções Meningocócicas Tipo de estudo: Risk_factors_studies Limite: Adolescent / Adult / Child / Child, preschool / Humans / Infant Idioma: En Revista: J Clin Microbiol Ano de publicação: 2016 Tipo de documento: Article