Detection of poxtA- and optrA-carrying E. faecium isolates in air samples of a Spanish swine farm.

•poxtA and optrA-carrying E. faecium were detected in air samples of a swine farm.•We report the first description of the poxtA gene in Spain.•The E. faecium isolates showed a multiresistance phenotype.•The poxtA gene was transferred by conjugation together with the fexB gene.