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.
Summerfield A, Hofmann MA, McCullough KC.Summerfield A, et al.Vet Immunol Immunopathol. 1998 May 29;63(3):289-301. doi: 10.1016/s0165-2427(98)00108-1.Vet Immunol Immunopathol. 1998.PMID: 9656461
Summerfield A, Knoetig SM, Tschudin R, McCullough KC.Summerfield A, et al.Virology. 2000 Jun 20;272(1):50-60. doi: 10.1006/viro.2000.0361.Virology. 2000.PMID: 10873748Free article.