Table 1.

Sources, sample types, and isolation information for the 167 S. Enteritidis isolates analyzed in the present study

SourceNo. of isolatesaSamplesState(s)bYr
Human34Clinical isolates from stools and foods related to outbreaks13 states2001–2009
Chicken46Clinical isolates from broilersPA2007–2009
Egg243 shell egg isolatesPA1998–1999
21 shell egg isolatesPA2007–2010
Environment6346 drag swab isolates from pullet and layer housesPA1998–1999
17 drag swab isolates from pullet and layer housesPA2007–2010
  • a Human isolates were received from the CDC (Centers for Disease Control and Prevention). Egg and environmental isolates were from PEQAP (Pennsylvania Egg Quality Assurance Program). Chicken isolates were from the ADL (Animal Diagnostic Lab) at Penn State University.

  • b Human clinical isolates were from 13 states, including California, Colorado, Connecticut, Georgia, Idaho, Maine, Michigan, Minnesota, Ohio, Oregon, Pennsylvania, South Carolina, and West Virginia.