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.
Heeney JL, van Els C, de Vries P, ten Haaft P, Otting N, Koornstra W, Boes J, Dubbes R, Niphuis H, Dings M, Cranage M, Norley S, Jonker M, Bontrop RE, Osterhaus A.Heeney JL, et al.J Exp Med. 1994 Aug 1;180(2):769-74. doi: 10.1084/jem.180.2.769.J Exp Med. 1994.PMID: 8046353Free PMC article.