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.
Zan M, Evans P, Lucas-Lenard J.Zan M, et al. Among authors: lucas lenard j.Virology. 1990 Jul;177(1):75-84. doi: 10.1016/0042-6822(90)90461-y.Virology. 1990.PMID: 2162117