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The rate of mcr-1-harbouring isolates grouped by different factors. (a–b) The rates of mcr-1-harbouring isolates among the total Salmonella sp. strains in different years (a) and in different age groups (b). (c) The rates of mcr-1-harbouring S. Typhimurium strains among just the S. Typhimurium isolates in different age groups. (d) The rates of mcr-1-harbouring isolates among the total Salmonella sp. strains in different serotypes.
