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.
Gel images sent by CMDs in EQA surveys conducted in 2001 (A) and 2003 (B). In 2001, center 1 used IS256 PCR; centers 2 to 6 and 9 performed PFGE, with center 3 testing two protocols, an in-house protocol [center 3 (1)] and the ULB SOP [center 3 (2)]; centers 7 and 8 performed RAPD PCR; and center 11 sent no picture. In 2003, centers 2 to 6, 9, and 11 performed PFGE, and center 8 used RAPD PCR.
