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.
Liu BH, Chu FS.Liu BH, et al. Among authors: chu fs.Appl Environ Microbiol. 1998 Oct;64(10):3718-23. doi: 10.1128/AEM.64.10.3718-3723.1998.Appl Environ Microbiol. 1998.PMID: 9758790Free PMC article.