Duration of detection of fecal excretion of Escherichia coli O157 : H7 in cattle.
To better define the bovine reservoir of Escherichia coli O157 : H7, cattle were tested monthly by bacteriologic culture for fecal excretion of E. coli.
E. coli O157 : H7 was isolated from feces of 56 cattle sampled an average of 6.98 times (2-12 samples).
By broth enrichment culture, immunomagnetic separation, or both, 35 cattle had 1 positive sample, 12 had 2,7 had 3, and 1 each had 4 and 5. Five cattle with =2 positive samples were in a herd in which 5 pulsed-field gel electrophoretic (PFGE) types were simultaneously present ; in 3 of these cattle, different PFGE types were detected in different samples.
The duration of detected excretion E. coli O157 : H7 by individual cattle in this study was<1 month in 35 (63%) of 56 cattle.
Both serial and concurrent excretion of different E. coli O157 : H7 strains by individual cattle was observed.
Mots-clés Pascal : Contamination, Escherichia coli, Enterobacteriaceae, Bactérie, Réservoir, Bétail, Mesure, Temps exposition, Etude expérimentale, Animal, Infection
Mots-clés Pascal anglais : Contamination, Escherichia coli, Enterobacteriaceae, Bacteria, Reservoir, Livestock, Measurement, Exposure time, Experimental study, Animal, Infection
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0237013
Code Inist : 002B05A04. Création : 11/06/1997.