PRC-NOTES_3MT_P2

Bull's eye colonies

• Escherichia coli
• Klebsiella spp.
• Enterobacter spp.
• Citrobacter spp.
• Yersinia spp.

Fish eye colonies

• Escherichia coli
• Klebsiella spp.
• Enterobacter spp.
• Citrobacter spp.
• Yersinia spp.

E. coli on MAC

• Pink with halo
• Greenish metallic sheen (pink to purple colonies)
• Yellow to orange colonies with salmon to orange halo
• Yellow colonies only

E. coli on EMB

• Pink with halo
• Greenish metallic sheen (pink to purple colonies)
• Yellow to orange colonies with salmon to orange halo
• Yellow colonies only

E. coli on HEA

• Pink with halo
• Greenish metallic sheen (pink to purple colonies)
• Yellow to orange colonies with salmon to orange halo
• Yellow colonies only

E. coli on XLD

• Pink with halo
• Greenish metallic sheen (pink to purple colonies)
• Yellow to orange colonies with salmon to orange halo
• Yellow colonies only

Opportunistic infections include: UTI, RT, and wound infections.

• Escherichia coli
• Klebsiella spp.
• Enterobacter spp.
• Citrobacter spp.

Produces heat-labile (LT) and/or heat stable (ST) enterotoxins; genes both toxin reside on a plasmid.

• Enterotoxigenic E. coli (ETEC)
• Enteroinvasive E. coli (EIEC)
• Enteropathogenic E. coli (EPEC)
• Enterohemorrhagic E. coli (EHEC)
• Enteroaggregative E. coli (EAEC)

LTs are closely related in structure and function to cholera toxin; STs result in net intestinal fluid secretion by stimulating guanylate cyclase

• Enterotoxigenic E. coli (ETEC)
• Enteroinvasive E. coli (EIEC)
• Enteropathogenic E. coli (EPEC)
• Enterohemorrhagic E. coli (EHEC)
• Enteroaggregative E. coli (EAEC)

Associated with Montezuma's revenge

• Enterotoxigenic E. coli (ETEC)
• Enteroinvasive E. coli (EIEC)
• Enteropathogenic E. coli (EPEC)
• Enterohemorrhagic E. coli (EHEC)
• Enteroaggregative E. coli (EAEC)