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.
Yang P, Henderson AJ.Yang P, et al. Among authors: henderson aj.Virology. 2005 Jun 5;336(2):219-28. doi: 10.1016/j.virol.2005.03.021.Virology. 2005.PMID: 15892963Free article.