Table 2. Transfection of phage DNA isolated from sewage in E. coli WG5 and C600 strains.

		Sample number
		Sewage 6	Sewage 7	Sewage 15
	µg of phage DNA transfected	2.60	1.14	1.74
Ampicillin/Nal WG5	N° of ap/nal resistant clonesa	552	422	310
	% bla TEM b	10.0	13.6	16.6
	%bla CTX-M b	6.8	1.7	13.3
Ampicillin/Nal C600nalR	N° of ap/nal resistant clonesa	89	101	42
	% bla TEM	3.6	7.7	6.2
	%bla CTX-M	0	1.2	0

^aAveraged number of colonies per plate after transduction.

^bPercentage of colonies where these genes have been detected by PCR and confirmed by sequencing.