Influenza vaccination with a live attenuated vaccine.

Influenza is a highly contagious, acute respiratory illness with a long history of outbreaks dating back several centuries. Although immunization is an effective means of protection against influenza, vaccination rates have been suboptimal, especially among certain high-risk groups, including children and health care personnel. This article reviews basic information about influenza and immunization, discusses the relevance of children as vectors of disease, and highlights current information on FluMist, an intranasally administered, live attenuated influenza vaccine, including studies of its use compared with trivalent inactivated vaccine and in children.