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.
BOORMAN JP, PORTERFIELD JS.BOORMAN JP, et al. Among authors: porterfield js.Trans R Soc Trop Med Hyg. 1957 Sep;51(5):439-49. doi: 10.1016/0035-9203(57)90079-2.Trans R Soc Trop Med Hyg. 1957.PMID: 13468005No abstract available.