TABLE 1.

Phage-resistant mutation rate

Culture	N a	CK4 b	DEV b	E217 b
1	2.2	616	864	1,328
2	1.3	288	241	760
3	2.3	628	844	1,344
4	1.9	236	357	776
5	2.5	440	564	1,552
6	1.8	516	668	1,128
7	2.1	474	466	1,044
8	2.3	538	708	1,044
9	1.9	426	804	884
10	1.5	1,424	2,120	2,288
µ c		4.3 × 10-7	5.7 × 10−7	8.5 × 10−7

^a Plated PAO1 cfu (×10⁸).

^b Colonies obtained by plating PAO1 on 5 × 10⁸ pfu of the indicated phages.

^c Mutation rate per cell per division.