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.
García-Sastre A, Biron CA.García-Sastre A, et al.Science. 2006 May 12;312(5775):879-82. doi: 10.1126/science.1125676.Science. 2006.PMID: 16690858Review.