TABLE 2.

Frequencies of LPS phase variation in H. pylori NCTC 11637, its mutants, and its variants

Strain	MAb	Estimated no. of colonies on blots	No. (%) of positive colonies
K1.4 mutant	Anti-Lewis x	3,000	5 (0.2)
K6.1 varianta	Anti-i	5,000	39 (0.78)
B1.5 mutant	Anti-Lewis x	900	0 (0)
B3.1 variant	Anti-Lewis x	6,386	0 (0)
1b variant	Anti-Lewis x	1,400	1 (0.07)
2b variant	Anti-Lewis y	1,850	19 (1)
3c variant	Anti-Lewis y	6,400	18 (0.28)
1c variant	Anti-Lewis x	3,200	0b
	Anti-Lewis y

^aK6.1 is a phase variant (Lewis x⁺,i⁻) isolated from K1.4 mutant. 

^bNumber of negative colonies.