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.
Ruggli N, Tratschin JD, Schweizer M, McCullough KC, Hofmann MA, Summerfield A.Ruggli N, et al. Among authors: mccullough kc.J Virol. 2003 Jul;77(13):7645-54. doi: 10.1128/jvi.77.13.7645-7654.2003.J Virol. 2003.PMID: 12805464Free PMC article.
Bauhofer O, Summerfield A, McCullough KC, Ruggli N.Bauhofer O, et al. Among authors: mccullough kc.Virology. 2005 Dec 5;343(1):93-105. doi: 10.1016/j.virol.2005.08.016. Epub 2005 Sep 8.Virology. 2005.PMID: 16154171Free article.