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J Infect ; 72(3): 295-301, 2016 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-26724770

RESUMO

OBJECTIVES: We aimed to examine the dynamics of Staphylococcus aureus nasal carriage in healthy adults. METHOD: Selected S. aureus strains isolated from weekly nasal swabs obtained from 122 healthy young adults over a 13 week period were spa typed. RESULTS: The median duration of intermittent carriage was 4 weeks (IQR 2-6) and the median interval between episodes of carriage of different spa types was 3.5 weeks (IQR 2.25-4). 6/19 (32%) Persistent carriers were colonised with more than one spa type during the study, and in two persistent carriers a brief period of mixed colonisation with two spa types was observed. Even when the carriage strain changed, it was very rare for persistent carriers to have a period during which they were culture-negative (only 6/188 (3%) swabs submitted by persistent carriers failed to culture S. aureus). CONCLUSIONS: Our results imply that at least every eight weeks a healthy young adult is exposed to S. aureus sufficient to cause a new episode of carriage among intermittent carriers. Persistent carriers are almost always colonised with S. aureus and over the course of a year there will be at least one replacement of the dominant strain.


Assuntos
Portador Sadio/epidemiologia , Portador Sadio/microbiologia , Mucosa Nasal/microbiologia , Infecções Estafilocócicas/epidemiologia , Infecções Estafilocócicas/microbiologia , Staphylococcus aureus/classificação , Staphylococcus aureus/isolamento & purificação , Feminino , Variação Genética , Humanos , Estudos Longitudinais , Masculino , Tipagem Molecular , Proteína Estafilocócica A/genética , Staphylococcus aureus/genética , Adulto Jovem
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