Table 2. O-groups that may be potentially merged based on similarities in O-AGC nucleotide sequence and serological cross-reactions.

Set #	Identity 98–99.9%	Suggested O group
1	O42/O28ac	O42
2	O13/O129/O135	O13
3	O107/O117	O107
4	O123/O186	O123
5	O125ab/O125ac	O125
6	O18ab/O18ac	O18
7	OX6/O168	O168
8	OX10/O159	O159
9	OX21/O163	O163
10	OX38/O128	O128
11	OX43/O19	O19