Figure 2

PFGE patterns of Salmonella Enteritidis strains with known subpopulation characteristics. Lanes 1 and 4, DNA fragment size markers; lane 2, PT13a S. Enteritidis strain 21027, which forms biofilm but does not contaminate eggs; lane 3, PT13a S. Enteritidis strain 21046, which does not form biofilm but does contaminate eggs; lane 5, PT4 S. Enteritidis strain 22079, which forms biofilm and contaminates eggs. S. Enteritidis strains 21027, 22079 and 21046 had the 1^st, 6^th and 10^th most common PFGE profiles in the US, respectively, according to PulseNet typing classification schemes. Relative incidence may change by publication date.