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.
Elvander M, Vilcek S, Baule C, Uttenthal A, Ballagi-Pordány A, Belák S.Elvander M, et al. Among authors: uttenthal a.J Gen Virol. 1998 Dec;79 ( Pt 12):2939-46. doi: 10.1099/0022-1317-79-12-2939.J Gen Virol. 1998.PMID: 9880007