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.
Microscopic granuloma in spleen (▧) and liver (□) for vaccinated and control guinea pigs 5 weeks after challenge with virulent M. bovis strains. A granuloma was defined as a discrete accumulation of cells consisting predominantly of macrophages.
