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.
Philip RN, Casper EA.Philip RN, et al. Among authors: casper ea.Am J Trop Med Hyg. 1981 Jan;30(1):230-8. doi: 10.4269/ajtmh.1981.30.230.Am J Trop Med Hyg. 1981.PMID: 6782899
Philip RN, Lane RS, Casper EA.Philip RN, et al. Among authors: casper ea.Am J Trop Med Hyg. 1981 May;30(3):722-7. doi: 10.4269/ajtmh.1981.30.722.Am J Trop Med Hyg. 1981.PMID: 6789691