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.
Djavani M, Lukashevich IS, Sanchez A, Nichol ST, Salvato MS.Djavani M, et al. Among authors: nichol st.Virology. 1997 Sep 1;235(2):414-8. doi: 10.1006/viro.1997.8722.Virology. 1997.PMID: 9281522Free article.
Honig JE, Osborne JC, Nichol ST.Honig JE, et al. Among authors: nichol st.Virology. 2004 Mar 30;321(1):29-35. doi: 10.1016/j.virol.2003.09.042.Virology. 2004.PMID: 15033562Free article.