Table I.

Seropathotype scheme for Verotoxigenic Escherichia coli as proposed by Karmali et al (20)

Seropathotype	Relative incidence	Outbreaks	Cause of HC or HUS	Serogroup
A	High	Common	Yes	O157:H7, O157:NM
B	Moderate	Uncommon	Yes	O26:H11, O103:H2, O111:NM, O121:H19, O145:NM
C	Low	Rare	Yes	O91:H21, O104:H21, O113:H21, others
D	Low	Rare	No	Multiple
E	Nonhuman	NA	NA	Multiple

HC — hemmorrhagic colitis.

HUS — hemolytic uremic syndrome.

NA — not applicable.

Adapted from reference 20.