1. National Institute of Medical Sciences and Nutrition Salvador Zubirán; DelegaciónTlalpan Mexico
2. Institute of Biomedical Research; National Autonomous University of Mexico; México, D.F México
3. National School of Biological Sciences; IPN; Mexico D.F Mexico
4. Division of Infection Medicine; Department of Clinical Sciences; Lund University; Lund Sweden
5. Centre for Clinical Microbiology; UCL (University College London); London UK