The Committee on House Administration is pleased to present this revised book on our United States Government. This publication continues to be a popular introductory guide for American citizens and those of other countries who seek a greater understanding of our heritage of democracy. The question-and-answer format covers a broad range of topics dealing with the legislative, executive, and judicial branches of our Government as well as the electoral process and the role of political parties.--Foreword.

The Immunization Safety Review Committee was established by the Institute of Medicine (IOM) to evaluate the evidence on possible causal associations between immunizations and certain adverse outcomes, and to then present conclusions and recommendations. The committee's mandate also includes assessing the broader societal significance of these immunization safety issues. While all the committee members share the view that immunization is generally beneficial, none of them has a vested interest in the specific immunization safety issues that come before the group. The committee reviews three immunization safety review topics each year, addressing each one at a time. In this fifth report in a series, the committee examines the hypothesis that exposure to polio vaccine contaminated with simian virus 40 (SV40), a virus that causes inapparent infection in some monkeys, can cause certain types of cancer.