Table 1. Rate of phenotypic phase variation between different strains of S. Typhimurium.

Strain	On to Off	Off to On
798	1.5×10−6	1.7×10−4
SL1344	3.0×10−6	3.2×10−2 *
14028	4.8×10−6	1.2×10−2 *
LT2	Not detectable	Not determined

^*Significant at ≤0.03 compared to strain 798.