FIG. 2.

Log₂ verocytotoxin titers in the RBC fractions of clinical (n = 15) and selected subclinical (n = 5) pigs inoculated with Stx2e-producing E. coli. All five subclinical pigs had at least one blood sample positive for verocytotoxin. A sample was considered to be positive for Stx2e if the Vero cell titer was ≥6 log₂ units and the sample (or another sample of the same type from the same pig) was neutralized by a bovine polyclonal antibody against Stx2e but was not neutralized by fetal calf serum. The line indicates the maximum nonspecific verocytotoxicity of blood.