Beware of the big guys: Red snappers from tropical waters sometimes accumulate high levels of the toxin that causes ciguatera. Go for the smaller fish to avoid it. Kamel Adjenef/iStockphoto hide caption

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University of Miami pediatrician Judith Schaechter gives a girl an HPV vaccination in 2011. Joe Raedle/Getty Images hide caption

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In the U.S., doctors no longer have the option of treating gonorrhea with a pill. Instead, they are advised to use an injectable antibiotic, which is still effective against the bacteria. iStockphoto.com hide caption

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