Table 2.

Rates of secondary PAI transfer to OG1SSp

Donor strain	Donor type	Transfer frequency
TC7	PFGE profile A	ND <4.4 × 10−11
TC3	PFGE profile B	ND <7.9 × 10−11
TC4	PFGE profile C	ND <1.0 × 10−11
TC5	PFGE profile D	ND <6.4 × 10−11
TC12	PFGE profile E	ND <3.2 × 10−11
TC1	PFGE profile A* + pTEF2	2.9 (± 1.6) × 10−9
TC9	PFGE profile C + pTEF2	2.7 (± 1.2) × 10−9

ND, Not detected over limit of detection indicated.

*As defined in Fig. 2.