Detection of colistin resistance mcr-1 gene in Salmonella enterica serovar Rissen isolated from mussels, Spain, 2012 to 2016

Abstract

Nineteen <i>Salmonella</i> strains were isolated from 5,907 randomly selected mussel samples during a monitoring programme for the presence of <i>Salmonella</i> in shellfish in Galicia, north-west Spain (2012-16). Serovars, sequence type and antimicrobial resistance genes were determined through genome sequencing. Presence of the <i>mcr</i>-1 gene in one strain belonging to serovar Rissen and ST-469 was identified. The <i>mcr</i>-1 gene had not been isolated previously in environmental <i>Salmonella</i> isolated from mussels in Spain.