An official website of the United States government
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
 Image Number D1441-1 |
A cow naturally infected with M. avium subspecies paratuberculosis that is in the late stages of disease and has typical clinical signs such as weight loss, watery diarrhea, and general poor health. This cow is part of a study herd used in research on Johne’s disease at the National Animal Disease Center, Ames, Iowa.
Photo by Peggy Greb.
