1. Laboratório de Genética Molecular de Bactérias, Departamento de Microbiologia, Instituto de Biotecnologia Aplicada à Agropecuária – BIOAGRO, Universidade Federal de Viçosa, Viçosa, 36570–900, Brazil
2. Section of Paediatric Infectious Disease, Imperial College London, St Mary's Campus, London W2 1PG, UK
3. Department of Pathogen Molecular Biology, London School of Hygiene and Tropical Medicine, Keppel Street, London, WC1E 7HT, UK