Figure 1From: E. coli O157 on Scottish cattle farms: Evidence of local spread and persistence using repeat cross-sectional dataThe geographical distribution of Scottish farms from both Survey 1 (SEERAD, left) and Survey 2 (IPRAVE, right) surveys (n = 447). Left: Survey 1 (SEERAD, 1998-2000). White circles represent E. coli O157 negative farms, black circles represent E. coli O157 positive farms. Right: Survey 2 (IPRAVE, 2002-2004). White circles represent O157 negative farms, black circles represent E. coli O157 positive farms and red circles represent the 27 farms that were E. coli O157 positive in both surveys.Back to article page