TABLE 3.

Conjugation experiment between ESBL-producing E. coli from poultry litter and non-ESBL-producing E. coli from the microbiota of chicks.

	Strain	Phylogenetic group	blaCTX–M gene	fosA3 gene
Donors	EcPR1	B1	blaCTX–M55	+
	EcPR2	B1	blaCTX–M55	+
Recipients	EcRS1	D	blaCTX–M8	−
	EcRS2	D	blaCTX–M8	−
Transconjugants	T1 (EcPR1+EcRS1)	D	blaCTX–M8 / blaCTX–M55	+
	T4 (EcPR1+EcRS2)	D	blaCTX–M8 / blaCTX–M55	+

(+) Presence; (−) Absence.