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.
Beck DL, Van Dolleweerd CJ, Lough TJ, Balmori E, Voot DM, Andersen MT, O'Brien IE, Forster RL.Beck DL, et al.Proc Natl Acad Sci U S A. 1994 Oct 25;91(22):10310-4. doi: 10.1073/pnas.91.22.10310.Proc Natl Acad Sci U S A. 1994.PMID: 7937946Free PMC article.
Webster DE, Guy PL, Beck DL, Forster RL.Webster DE, et al. Among authors: beck dl.Arch Virol. 1999;144(10):2059-64. doi: 10.1007/s007050050727.Arch Virol. 1999.PMID: 10550678