Tittle: Megaprosthesis Infection by Bacteroides fragilis in a patient with Ewing’s Sarcoma: a case report and literature review.Authors: Yoleidys  Martinez-Ysasis1. Antonella Francesca Simonetti2. Ferran Navarro3.e-mail address: [email protected] Department, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain.2Infectious Diseases Unit, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain;3Genetics and Microbiology Department. Universitat Autònoma de Barcelona, Spain; Sant Pau Institute of Biomedical Research (IIb Sant Pau), Barcelona, Spai; Microbiology Department, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain .Corresponding author: Ferran Navarro.email address : [email protected]