Characterization of eae+ Escherichia coli isolated from healthy and diarrheic calves.
Strains of Escherichia coli from 101 healthy and 114 diarrheic calves were screened by PCR for the eae (intimin) gene and Shiga toxin genes (stx). Each eae+ and eae/stx+ strain was examined for antimicrobial susceptibility, enterohemolysin activity, and the somatic O antigen was determined. An immunoassay was used to detect Shiga toxin antigens for the eae/stx+ E. coli. Significantly more (p = 0.005) of the healthy calves carried eae+ and eae/stx+ E. coli in their feces when compared to strains from diarrheic calves. Moreover, Shiga toxin antigens were detected significantly more (p = 0.001) often among the eae/stx+ strains from healthy calves when compared to eae/stx+ strains from diarrheic calves. However, significantly more (p = 0.001) of the eae+ and eae/stx+ strains from diarrheic calves were resistant to at least one of the antimicrobials tested, and the strains from diarrheic calves had a significantly (p = 0.05) higher rate of antimicrobial resistance to at least two different antimicrobial classes. No significant difference (p> or =0.05) was detected among the eae+ and eae/stx+ strains from healthy and diarrheic calves for enterohemolysin production. Serogroups O-negative, O5, O26, and O111 were predominate among both healthy and diarrheic calves.
Holland
R E
RE
Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, 48824, USA. rholland@cvm.msu.edu
Wilson
R A
RA
Holland
M S
MS
Yuzbasiyan-Gurkan
V
V
Mullaney
T P
TP
White
D G
DG
D018829:Adhesins, Bacterial; D000372:Agglutination Tests / Q000662:veterinary; D000818:Animals; D000942:Antigens, Bacterial / Q000032:analysis; D001425:Bacterial Outer Membrane Proteins / Q000737:chemistry / Q000235:genetics*; D001427:Bacterial Toxins / Q000737:chemistry / Q000235:genetics; D002352:Carrier Proteins; D002417:Cattle; D002418:Cattle Diseases / Q000382:microbiology*; D017931:DNA Primers / Q000737:chemistry; D004269:DNA, Bacterial / Q000737:chemistry; D003967:Diarrhea / Q000382:microbiology / Q000662:veterinary*; D004352:Drug Resistance, Microbial; D004587:Electrophoresis, Agar Gel / Q000662:veterinary; D004768:Enterotoxins / Q000737:chemistry / Q000235:genetics; D004926:Escherichia coli / Q000145:classification / Q000235:genetics / Q000472:pathogenicity*; D004927:Escherichia coli Infections / Q000382:microbiology / Q000662:veterinary*; D029968:Escherichia coli Proteins; D005243:Feces / Q000382:microbiology; D005260:Female; D006460:Hemolysin Proteins / Q000032:analysis; D007124:Immunoenzyme Techniques / Q000662:veterinary; D007422:Intestines / Q000473:pathology; D008824:Michigan; D016133:Polymerase Chain Reaction / Q000662:veterinary; D022603:Shiga Toxins
D018829:Adhesins, Bacterial; D000942:Antigens, Bacterial; D001425:Bacterial Outer Membrane Proteins; D001427:Bacterial Toxins; D002352:Carrier Proteins; D017931:DNA Primers; D004269:DNA, Bacterial; D004768:Enterotoxins; D029968:Escherichia coli Proteins; D006460:Hemolysin Proteins; D022603:Shiga Toxins; C073819:eaeA protein, E coli