Table 1.

Pathogenic and control strains used in this study, their sources, and other characteristics

Strain	Culture collection	Origin/isolation	Comments	Application	Growth conditions
Escherichia coli O157:H7	ATCC 700728	Undetermined	Nontoxigenic Absence of Shiga toxin genes confirmed by PCR	Quality control strain for BBL chromagar	37ºC; Nutrient Broth or Nutrient Agar
Escherichia coli O111, 172	Isolate	Raw ewes’ milk	Nonverotoxigenic Nonhemolytic Resistant to ampicillin, bacitracin, cloxacillin, penicillin G, sulfamethoxazole, and tylosin
Escherichia coli	ATCC 25922, CECT 434	Clinical	Incorrectly cited in previous editions of this catalog as identical to NCTC 10418 Biotype 1	Food testing control culture, control strain; susceptibility testing; evaluation of Muller‐Hinton Agar	37ºC Trypticase Soy Agar Broth
Enterococcus faecalis	ATCC 29212	Urine	NS	Food testing control strain; susceptibility testing; evaluation of Mueller‐Hinton Agar	37ºC Trypticase Soy Agar Broth with defibrinated sheep blood

Abbreviations: ATCC, American Type Culture Collection; CECT, Colección Española de Cultivo Tipo; NS, Not specified.