1. Centro de Pesquisa Experimental, Instituto de Ensino e Pesquisa Albert Einstein - Av. Albert Einstein 627, 05651-901, São Paulo, SP, Brazil 2Infection Control Service, Hospital da Beneficência Portuguesa de São Paulo, São Paulo, Brazil 3Infection Control Service, Hospital Israelita Albert Einstein, São Paulo, Brazil 4Laboratorium voor Microbiologie, Faculteit Wetenschappen, Universiteit Gent, Gent, Belgium