Mike Sharland1, Praveen Saroey2, Eitan Naaman Berezin3. 1. Paediatric Infectious Diseases Research Group, St George's University of London, London, United Kingdom. Electronic address: msharlan@sgul.ac.uk. 2. Paediatric Infectious Diseases Research Group, St George's University of London, London, United Kingdom. 3. Faculdade de Ciências Médicas da Santa Casa de São Paulo, São Paulo, SP, Brazil.