Dr. Donald Brown inoculated Kelly Kent with the HPV vaccine in his Chicago office in the summer of 2006 — not long after the first version of the vaccine reached the market. Charles Rex Arbogast/AP hide caption

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Walt Whitman High School's Caroline Schweitzer runs through a host of Severna Park High School defenders during a semifinal game in Maryland's Class 4A/3A lacrosse tournament in May. Toni L. Sandys/The Washington Post/Getty Images hide caption

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Brian Zikmund-Fisher with his wife, Naomi, and daughter, Eve, in 1999, after he had a bone marrow transplant. He says he made the decision to have the treatment based on factors he couldn't quantify. Courtesy of Brian Zikmund-Fisher hide caption

itoggle caption Courtesy of Brian Zikmund-Fisher

Texas gubernatorial hopeful and state Sen. Wendy Davis came to prominence when she opposed legislation restricting abortions. The bill eventually became law and is now blamed for the closure of abortion clinics across the state. LM Otero/AP hide caption

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The CDC's director, Tom Frieden, testified before a congressional subcommittee Wednesday regarding a recent anthrax incident and lab safety improvements he is instituting. AFP/Getty Images hide caption

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