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.
Maillard I, Launois P, Xenarios I, Louis JA, Acha-Orbea H, Diggelmann H.Maillard I, et al.J Virol. 1998 Apr;72(4):2638-46. doi: 10.1128/JVI.72.4.2638-2646.1998.J Virol. 1998.PMID: 9525580Free PMC article.