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.
Fraile A, Malpica JM, Aranda MA, Rodríguez-Cerezo E, García-Arenal F.Fraile A, et al. Among authors: aranda ma.Virology. 1996 Sep 1;223(1):148-55. doi: 10.1006/viro.1996.0463.Virology. 1996.PMID: 8806548Free article.