Update From the Advisory Committee on Immunization Practices.

The Advisory Committee on Immunization Practices (ACIP), a group of medical and public health experts, meets 3 times per year to develop recommendations for vaccine use in the United States. The group has 15 voting members, and each member's term is 4 years. ACIP members and Centers for Disease Control and Prevention (CDC) staff discuss the epidemiology of vaccine-preventable diseases and vaccine research, effectiveness, safety data, and clinical trial results. Representatives from the American Academy of Pediatrics (Carrie L. Byington and D. W. K.) and the Pediatric Infectious Diseases Society (S. T. O.) are present as liaisons to the ACIP. The ACIP met on June 21 to 22, 2017, to discuss catch-up vaccination for hepatitis A vaccine, influenza surveillance, influenza vaccine effectiveness, herpes zoster vaccine, the effect of varicella vaccination on the incidence of herpes zoster, meningococcal disease in patients taking eculizumab, and considerations for a potential third dose of measles, mumps, and rubella (MMR) vaccine to combat ongoing mumps outbreaks. Updates on dengue virus epidemiology, Zika virus vaccines, anthrax vaccine, yellow fever vaccine, and the Vaccine Adverse Event Reporting System were given also.