title: Impact of the direct application of therapeutic agents to the terminal recta of experimentally colonized calves on Escherichia coli O157:H7 shedding.
abstract: Enterohemorrhagic Escherichia coli O157:H7 is an important intestinal pathogen of humans with a main reservoir of domesticated ruminants, particularly cattle. It is anticipated that the risk of human infection can be reduced by controlling the organism within its reservoir hosts. Several options for the control of E. coli O157:H7 in cattle have been proposed, but none have been demonstrated to be successful in the field. Here we describe a novel experimental method, based on the terminal-rectum-restricted colonization described previously, to eliminate fecal carriage of E. coli O157:H7. In experimentally challenged calves, direct application to the rectal mucosa of either of two therapeutic agents, polymyxin B or chlorhexidine, greatly reduced bacterial shedding levels in the immediate posttreatment period. The most efficacious therapeutic agent, chlorhexidine, was compared in orally and rectally challenged calves. The treatment eliminated high-level shedding and reduced low-level shedding by killing bacteria at the terminal rectum. A rapid-detection system based on the ability to identify E. coli O157:H7 from swabs of the rectal mucosa was also assessed. This test was sufficiently sensitive to identify high-level bacterial carriage. Thus, a combination of the detection method and treatment regimens could be used in the field to eliminate high-level fecal excretion of E. coli O157:H7, so greatly reducing its prevalence within this host and the risk of human infection.
authors.affiliation: Animal Health Group, Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG, United Kingdom.
authors.forename: Stuart W
authors.initials: SW
authors.lastname: Naylor
authors.forename: Pablo
authors.initials: P
authors.lastname: Nart
authors.forename: Jill
authors.initials: J
authors.lastname: Sales
authors.forename: Allen
authors.initials: A
authors.lastname: Flockhart
authors.forename: David L
authors.initials: DL
authors.lastname: Gally
authors.forename: J Christopher
authors.initials: JC
authors.lastname: Low
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000008:administration & dosage* / Q000494:pharmacology; D002353:Carrier State / Q000188:drug therapy / Q000382:microbiology; D002417:Cattle; D002418:Cattle Diseases / Q000188:drug therapy / Q000382:microbiology; D002710:Chlorhexidine / Q000008:administration & dosage* / Q000494:pharmacology; D015169:Colony Count, Microbial; D004927:Escherichia coli Infections / Q000188:drug therapy / Q000382:microbiology / Q000662:veterinary; D019453:Escherichia coli O157 / Q000187:drug effects* / Q000302:isolation & purification*; D005243:Feces / Q000382:microbiology*; D011112:Polymyxin B / Q000008:administration & dosage* / Q000494:pharmacology; D012007:Rectum / Q000187:drug effects / Q000382:microbiology*; D012680:Sensitivity and Specificity; D013048:Specimen Handling / Q000379:methods
chemical_list: D000900:Anti-Bacterial Agents; D011112:Polymyxin B; D002710:Chlorhexidine