Failure of the Congo red dye uptake test to discriminate between virulent and avirulent avian Escherichia coli.
Twenty avian Escherichia coli isolates from normal and diseased chickens were compared by use of three virulence tests. These tests included the uptake of Congo red dye, an embryo lethality test, and a quantitative microtiter complement resistance test. A direct correlation was seen between the results of the complement resistance test and the embryo lethality test. The results of the Congo red test did not correlate with the two other tests.
Spears
K R
KR
Department of Medical Microbiology, College of Veterinary Medicine, University of Georgia, Athens 30602.
Wooley
R E
RE
Brown
J
J
Nolan
L K
LK
D000818:Animals; D001431:Bacteriological Techniques / Q000662:veterinary*; D002645:Chickens / Q000382:microbiology*; D003224:Congo Red; D004926:Escherichia coli / Q000472:pathogenicity*; D011237:Predictive Value of Tests; D014774:Virulence
D003224:Congo Red