1 Laboratory of Teaching in Prevention and Control of Healthcare-associated Infections, Faculty of Medicine, Federal Fluminense University, Rio de Janeiro, Brazil. Electronic address: andrericardo@huap.uff.br.
2 Hôpitaux Universitaires de Genève, Service de prévention et contrôle de l'infection, Genève, Switzerland.
3 Department of Paediatrics and Child Health, Division of Paediatric Infectious Diseases, Stellenbosch University, South Africa.
4 Paediatric Infectious Diseases Research Group, St George's, University of London, London, UK.