Phenotypic and genotypic diversity among ST South African Klebsiella pneumoniae isolates resistant to extended-spectrum β-lactam antibiotics: S.Y. Essack, L.M.C. Hall, D.M. Livermore and D.G. Pillay*, Departments of Medical Microbiology, St. Bartholomew's and the Royal London School of Medicine and Dentistry, Turner Street, London, E1 2AD; *University of Natal, P.O. Box 17039, Congella, 4013, South Africa