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.
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.
Fecteau
Marie-Eve
ME
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
Whitlock
Robert H
RH
Buergelt
Claus D
CD
Sweeney
Raymond W
RW
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