TABLE 5.

Most commonly occurring serogroups among APEC isolates (n = 794)

Serogroup	Frequency	% Positive	Cumulative frequency	Cumulative %
NTa	175	22.3	175	22.3
78	145	18.5	320	40.8
2	103	13.1	423	53.9
Y	29	3.7	452	57.6
1	19	2.4	471	60
8	16	2	487	62
35	15	1.9	502	64
111	14	1.8	516	65.7
18	12	1.5	528	67.3
36	12	1.5	540	68.8
R	10	1.3	550	70.1
11	9	1.2	559	71.2
20	9	1.2	568	72.4
19	8	1	576	73.4
9	8	1	584	74.4
25	7	0.9	591	75.3

^aNT, nontypeable.