Table 3.

Transfer frequency of Borrelia burgdorferi erythromycin resistance

Donor	Recipient	Transfer frequency a	Spontaneous frequency
B31(HP)-EmR	Bacillus subtilis PY79	1.2 × 10−3	10−8
	B. subtilis BD224	1.0 × 10−4	<10−9
	Enterococcus faecalis JH2-2	4.5 × 10−5	5.4 × 10−8
	E. faecalis UV202	6.0 × 10−9	2.5 × 10−8
	E. faecalis JH2-2(pAD1)	7.0 × 10−7	2.3 × 10−8
Transconjugant from B31(HP)-EmR × PY79	B. subtilis PY79N	<10−9	<10−9
	B. subtilis PY1197	<10−9	<10−9
Transconjugant from B31(HP)-EmR × JH2-2	E. faecalis OG1-SSp	1.0 × 10−5	8.7 × 10−8
B31(LP)-EmR	B. subtilis PY79	1.1 × 10−2	10−8
	B. subtilis BD224	2.5 × 10−4	<10−9
	E. faecalis JH2-2	2.9 × 10−5	5.4 × 10−8
	E. faecalis UV202	1.7 × 10−7	2.5 × 10−8
	E. faecalis JH2-2(pAD1)	3.3 × 10−7	2.3 × 10−8
Transconjugant from B31(LP)-EmR × PY79	B. subtilis PY79N	<10−9	<10−9
	B. subtilis PY1197	<10−9	<10−9
Transconjugant from B31(LP)EmR × JH2-2	OG1-SSp	1.6 × 10−5	8.7 × 10−8

HP, high-passage; LP, low-passage; Em^R, erythromycin-resistant.

^aPer recipient.