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.
El Hakim AE, Shahein YE, Abdel-Shafy S, Abouelella AM, Hamed RR.El Hakim AE, et al.J Vet Sci. 2011 Sep;12(3):243-9. doi: 10.4142/jvs.2011.12.3.243.J Vet Sci. 2011.PMID: 21897098Free PMC article.