TABLE 4.

Loss of the CTXΦ genome from toxigenic V. cholerae strains (CTXΦ lysogens) and their derivatives carrying the RF of the CTXΦ genome in the gastrointestinal tracts of rabbits

Strain	% of excreted cells retaining CTXΦ genome at the following day after challengea:
	1	2	3	4	5
P-27459	100	100	100	100	100
Bang-2(pMSF8.2)	27.5	0.03	0.005	0.001	0
Bah-1(MSF8.2)	100	100	99.5	100	98.7
Bah-2(pMSF8.2)	18.6	0.72	0.005	0.001	0
MO10	100	100	100	100	100
Bengal-2(pMSF8.2)	12.8	0.25	0.019	0.005	0.001
55V71(pMSF8.2)	10.6	0.01	0.007	0	0
Env-81(pMSF8.2)	12.4	0.05	0.009	0	0.005
AM-15746(pMSF8.2)	15.2	0.95	0.007	0	0
AM-15714(pMSF8.2)	24.6	0.19	0.002	0	0

^aResults are averages of values obtained from at least three different rabbits which survived on the day of observation.