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.
Law KM, Wilton-Smith P, Farrar GH.Law KM, et al. Among authors: farrar gh.J Med Virol. 1985 Nov;17(3):255-66. doi: 10.1002/jmv.1890170307.J Med Virol. 1985.PMID: 2999324
Cranage MP, Baskerville A, Ashworth LA, Dennis M, Cook N, Sharpe S, Farrar G, Rose J, Kitchin PA, Greenaway PJ.Cranage MP, et al.Lancet. 1992 Feb 1;339(8788):273-4. doi: 10.1016/0140-6736(92)91335-6.Lancet. 1992.PMID: 1346285