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.
Heukelbach J, de Oliveira FA, Kerr-Pontes LR, Feldmeier H.Heukelbach J, et al.Trop Med Int Health. 2001 Aug;6(8):635-42. doi: 10.1046/j.1365-3156.2001.00762.x.Trop Med Int Health. 2001.PMID: 11555429Free article.