Microorganisms
The strain used throughout this study was Streptomyces pristinaespiralis Pr 11, a
pristinamycins overproducing mutant strain provided by Sanofi-Aventis (Vitry sur
Seine, France). Listeria ivanovii was used as a pristinamycins sensitive strain to detect
the presence of pristinamycins in the culture broth of S. pristinaespiralis.