Resistance Trends of the Bacteroides fragilis Group over a 10-Year Period, 1997 to 2006, in Madrid, Spain

Carmen Betriu, Esther Culebras, Maria Gomez, Fatima Lopez, Iciar Rodriguez-Avial and Juan J. Picazo

Antimicrobial Agents and Chemotherapy 52 ( 7 ): 2686 - 2690 , 2008