High rates of human fecal carriage of mcr-1-positive multi-drug resistant Enterobacteriaceae isolates emerge in China in association with successful plasmid families by Zhong, L, Phan, H, Shen, C, Vihta, K, Sheppard, A, Huang, X, Zeng, K, Li, H, Zhang, X, Patil, S, Crook, D, Walker, A, Zing, Y, Lin, J, Feng, L, Doi, Y, Xia, Y, Stoesser, N, Tian, G