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.
Godfrey SA, Lovell HC, Mansfield JW, Corry DS, Jackson RW, Arnold DL.Godfrey SA, et al.PLoS Pathog. 2011 Mar;7(3):e1002010. doi: 10.1371/journal.ppat.1002010. Epub 2011 Mar 31.PLoS Pathog. 2011.PMID: 21483484Free PMC article.