title: Exposure of young dairy cattle to Mycobacterium avium subsp. paratuberculosis (MAP) through intensive grazing of contaminated pastures in a herd positive for Johne's disease.
abstract: This study investigated the susceptibility of 1- to 2-year-old cattle to Mycobacterium avium subsp. paratuberculosis (MAP) on pasture previously grazed by infected cattle. The exposure of yearling cattle to pastures contaminated with MAP resulted in infection with MAP, showing that age resistance to infection can be overcome by pressure of infection.
authors.affiliation: Department of Clinical Studies - New Bolton Center, School of Veterinary Medicine, University of Pennsylvania, 382 West Street Road, Kennett Square, Philadelphia, Pennsylvania 19348, USA. mfecteau@vet.upenn.edu
authors.forename: Marie-Eve
authors.initials: ME
authors.lastname: Fecteau
authors.forename: Robert H
authors.initials: RH
authors.lastname: Whitlock
authors.forename: Claus D
authors.initials: CD
authors.lastname: Buergelt
authors.forename: Raymond W
authors.initials: RW
authors.lastname: Sweeney
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000382:microbiology* / Q000635:transmission; D003612:Dairying; D004781:Environmental Exposure; D005243:Feces / Q000382:microbiology; D008297:Male; D016927:Mycobacterium avium subsp. paratuberculosis; D010283:Paratuberculosis / Q000235:genetics / Q000635:transmission*; D006109:Poaceae / Q000382:microbiology; D020133:Reverse Transcriptase Polymerase Chain Reaction