Barbara, M.D. Natterson-Horowitz

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When wildfires swept across Australia in February 2009, this photo of a firefighter sharing his water with an injured koala captured hearts around the world. The koala later died — not of fire-related injuries, but of chlamydia. Koalas in Australia are suffering from an epidemic of chlamydia, says Dr. Barbara Natterson-Horowitz. "There's no such thing as safe sex in the wild." Mark Pardew/AP hide caption

toggle caption Mark Pardew/AP

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