Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Origin of randomly isolated VTEC O157:H7 strainsbeing PT4, vtx2 and vtx2c from two different time periods. Map (a) illustrating the geographical origin of the 37 VTEC O157 isolates from the slaughterhouse survey performed between 1996-97, viz-à-viz a map (b) illustrating the geographical origin of the 29 VTEC O157 strains isolated in the 2002 slaughterhouse prevalence study. Strains being PT4, vtx2 and vtx2c marked (●); other (○).
