TABLE 3.

Efficiency of CTXφ infection in V. cholerae tolQRAB mutant strains^a

Recipientb	Relevant genotype	No. of recipients/ml	No. of transductants/mlc	Frequency of infectiond
O395	Wild type	3.7 × 109	9.0 × 106	2.4 × 10−3
DH1	tolQ	3.0 × 108	1.3 × 102	4.3 × 10−7
DH2	tolR	8.2 × 108	1.1 × 102	1.3 × 10−7
DH3	tolA	5.9 × 108	0	0
DH4	tolB	1.1 × 108	9.1 × 105	8.2 × 10−3

^aThe transduction assays were conducted at least four times, and the mean number of CFU from these experiments is presented. All standard deviations of these values were less than 10% of the means. 

^bAll recipients are derivatives of O395 (see Table 1). 

^cTransductants were counted as the number of Kn^r CFU per milliliter. 

^dThe frequency of infection was calculated by dividing the number of transductants per milliliter by the number of recipients per milliliter.