Fig. 2From: Longitudinal study of the mcr-1 gene prevalence in Spanish food-producing pigs from 1998 to 2021 and its relationship with the use of polymyxinsBox-plot diagram of the yearly distribution of mcr-1 gene abundance (expressed in copies/mg faecal content) in Spanish food-producing pigs from positives caecal samples. Black dots represent outliersBack to article page