WHO's list of the 12 most threatening pathogens includes (from left) Staphylococcus aureus (causing skin infections, pneumonia and bloodstream infections), Pseudomonas aeruginosa (causing blood infections, pneumonia, infections after surgery) and Neisseria gonorrhoeae (causing the sexually transmitted disease gonorrhea). NIAID, NIH Image Gallery/Flickr hide caption

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NIAID, NIH Image Gallery/Flickr

The bacteria were discovered in New Mexico's Lechuguilla Cave — a part of Carlsbad Caverns and the second deepest cave in the continental U.S. Courtesy of Max Wisshak hide caption

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Courtesy of Max Wisshak

Million-Year-Old 'Hero Bug' Emerges From Cave

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The FDA says there's no evidence that antibacterial soaps do a better job cleaning hands, and chemicals in them may pose health hazards. The FDA ban applies only to consumer products, not those used in hospitals and food service settings. Mike Kemp/Blend Images/Getty Images hide caption

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Mike Kemp/Blend Images/Getty Images

Bacteriophages, in red, look like tiny aliens, with big heads and skinny bodies. They use their "legs" to stick to and infect a bacterial cell, in blue. Biophoto Associates/Science Source hide caption

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Biophoto Associates/Science Source

Your Gut's Gone Viral, And That Might Be Good For Your Health

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These mitochondria, in red, are from the heart muscle cell of a rat. Mitochondria have been described as "the powerhouses of the cell" because they generate most of a cell's supply of chemical energy. But at least one type of complex cell doesn't need 'em, it turns out. Science Source hide caption

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Science Source

A colored enhanced scanning electron micrograph of Burkholderia pseudomallei. These motile bacteria are the cause of melioidosis, a tropical disease spread through contaminated water and soil. The bacteria can infect the skin, causing inflammation and muscle aches, or the lungs, causing chest pain, cough and in some cases pneumonia. Eye of Science hide caption

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Eye of Science
Thomas Kuhlenbeck/Ikon Images/Corbis

Wherever You Go, Your Personal Cloud Of Microbes Follows

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To Avoid Intestinal Distress While Traveling Overseas, Skip The Ceviche

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Loki's Castle, the field of deep sea vents between Norway and Greenland, is home to sediments containing DNA from the newly discovered archaea. R.B. Pedersen/Centre for Geobiology, Bergen, Norway hide caption

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R.B. Pedersen/Centre for Geobiology, Bergen, Norway

Missing Link Microbes May Help Explain How Single Cells Became Us

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Biologist Rob Knight, co-founder of the American Gut Project, recently moved the project to the University of California, San Diego's School of Medicine. Casey A. Cass/University of Colorado hide caption

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Casey A. Cass/University of Colorado