An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Woolcock AJ, Blackburn CR, Colman MH.Woolcock AJ, et al. Among authors: blackburn cr.Bull Int Union Tuberc. 1980 Mar-Jun;55(1-2):25-8.Bull Int Union Tuberc. 1980.PMID: 7214057French.No abstract available.