Co-occurrence of colistin-resistance genes mcr-1 and mcr-3 among multidrug-resistant Escherichia coli isolated from cattle, Spain, September 2015 Hernández, Marta and Iglesias, M Rocío and Rodríguez-Lázaro, David and Gallardo, Alejandro and Quijada, Narciso and Miguela-Villoldo, Pedro and Campos, Maria Jorge and Píriz, Segundo and López-Orozco, Gema and de Frutos, Cristina and Sáez, José Luis and Ugarte-Ruiz, María and Domínguez, Lucas and Quesada, Alberto, Eurosurveillance, 22, 30586 (2017), https://doi.org/10.2807/1560-7917.ES.2017.22.31.30586