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.
Herrington DA, Van de Verg L, Formal SB, Hale TL, Tall BD, Cryz SJ, Tramont EC, Levine MM.Herrington DA, et al. Among authors: levine mm.Vaccine. 1990 Aug;8(4):353-7. doi: 10.1016/0264-410x(90)90094-3.Vaccine. 1990.PMID: 2204243Clinical Trial.
Levine MM, Ferreccio C, Black RE, Tacket CO, Germanier R.Levine MM, et al.Rev Infect Dis. 1989 May-Jun;11 Suppl 3:S552-67. doi: 10.1093/clinids/11.supplement_3.s552.Rev Infect Dis. 1989.PMID: 2669099Review.