Zika virus particles (colored purple in this scan) infecting cells. Each particle is about 40 nanometers in diameter. CDC/Smith Collection/Gado/Getty Images hide caption

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CDC/Smith Collection/Gado/Getty Images

A Case Of Zika Apparently Spread From A Patient To A Family Caregiver

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The Centers for Disease Control and Prevention is updating its guidelines on preventing transmission of Zika virus via sexual activity. Stephanie Lynn/Flickr Flash/Getty Images hide caption

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Stephanie Lynn/Flickr Flash/Getty Images

The bacterium that causes syphilis is spread through sexual contact. It's easily cured with antibiotics, but can be hard to diagnose. CDC/Phanie/Science Source hide caption

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CDC/Phanie/Science Source

A Los Angeles County Department of Public Health worker shows condoms for weekly distribution to inmates in the Men's Central Jail. George Lavender hide caption

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George Lavender

California Prisons Aim To Keep Sex Between Inmates Safe, If Illegal

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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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Kamel Adjenef/iStockphoto

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

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Joe Raedle/Getty Images

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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iStockphoto.com