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.
Ravin N, Lane D.Ravin N, et al.J Bacteriol. 1999 Nov;181(22):6898-906. doi: 10.1128/JB.181.22.6898-6906.1999.J Bacteriol. 1999.PMID: 10559154Free PMC article.