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.
Graça da Silveira M, Vitória San Romão M, Loureiro-Dias MC, Rombouts FM, Abee T.Graça da Silveira M, et al.Appl Environ Microbiol. 2002 Dec;68(12):6087-93. doi: 10.1128/AEM.68.12.6087-6093.2002.Appl Environ Microbiol. 2002.PMID: 12450832Free PMC article.