Characterisation of a mobilisable plasmid conferring florfenicol and chloramphenicol resistance in Actinobacillus pleuropneumoniae

•First complete sequence of a floR plasmid from Actinobacillus pleuropneumoniae•Extended similarity to floR plasmids in other Pasteurellaceae species•Conjugal transfer between between species confirmed The complete nucleotide sequence of a 7.7kb mobilisable plasmid (pM3446F), isolated from a florfenicol resistant isolate of Actinobacillus pleuropneumoniae, showed extended similarity to plasmids found in other members of the Pasteurellaceae containing the floR gene as well as replication and mobilisation genes. Mobilisation into other Pasteurellaceae species confirmed that this plasmid can be transferred horizontally.