Tunisian Multicenter Study on the Prevalence of Colistin Resistance in Clinical Isolates of Gram Negative Bacilli: Emergence of <i>Escherichia coli</i> Harbouring the <i>mcr-1</i>... oleh Sana Ferjani, Elaa Maamar, Asma Ferjani, Khaoula Meftah, Hager Battikh, Besma Mnif, Manel Hamdoun, Yosra Chebbi, Lamia Kanzari, Wafa Achour, Olfa Bahri, Adenene Hammami, Meriam Zribi, Hanen Smaoui, Ilhem Boutiba-Ben Boubaker