 Image Number D3408-1 |
A skin-allergy instrument inoculated with groups of Salmonella being used on various regions of a cow’s skin.
Photo by Bob Droleskey.
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.