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Infect. Immun., May 1997, 1842-1848, Vol 65, No. 5
Copyright © 1997, American Society for Microbiology

Pathogenicity of Escherichia coli O157:H7 in the intestines of neonatal calves

EA Dean-Nystrom, BT Bosworth, WC Cray Jr and HW Moon
Enteric Diseases and Food Safety Research Unit, National Animal Disease Center, USDA Agricultural Research Service, Ames, Iowa 50010, USA. enystrom@nadc.ars.usda.gov

Cattle are an important reservoir of Shiga toxin-producing enterohemorrhagic Escherichia coli (EHEC) O157:H7 strains, foodborne pathogens that cause hemorrhagic colitis and hemolytic uremic syndrome in humans. EHEC O157:H7 strains are not pathogenic in calves >3 weeks old. Our objective was to determine if EHEC O157:H7 strains are pathogenic in neonatal calves. Calves <36 h old inoculated with EHEC O157:H7 developed diarrhea and enterocolitis with attaching and effacing (A/E) lesions in both the large and small intestines by 18 h postinoculation. The severity of diarrhea and inflammation, and also the frequency and extent of A/E lesions, increased by 3 days postinoculation. We conclude that EHEC O157:H7 strains are pathogenic in neonatal calves. The neonatal calf model is relevant for studying the pathogenesis of EHEC O157:H7 infections in cattle. It should also be useful for identifying ways to reduce EHEC O157:H7 infections in cattle and thus reduce the risk of EHEC O157:H7 disease in humans.


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