1. Yersinia Research Unit, Institut Pasteur, 28 rue du Dr Roux, 75724 Paris Cedex 15, France.
2. Plate‐forme de Microscopie Electronique, Institut Pasteur, 25 rue du Docteur Roux, 75015 Paris, France.
3. Genoscope, CNRS‐UMR 8030, Atelier de Génomique Comparative, 91006 Evry Cedex, France.
4. Laboratory of Zoonotic Pathogens, Rocky Mountain Laboratories, National Institute of Allergy and Infections Diseases, National Institutes of Health, Hamilton, MT 59840, USA.