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.
Lai MM, Patton CD, Baric RS, Stohlman SA.Lai MM, et al. Among authors: baric rs.J Virol. 1983 Jun;46(3):1027-33. doi: 10.1128/JVI.46.3.1027-1033.1983.J Virol. 1983.PMID: 6304334Free PMC article.