TABLE 1.

Classification of VTEC serotypes into seropathotypes

Seropathotype	Relative incidence	Frequency of involvement in outbreaks	Association with severe diseasea	Serotypes
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 only	NAb	NA	Multiple

^aHUS or hemorrhagic colitis.

^bNA, not applicable.