Lyme disease is spread by deer ticks like this one. A study finds that some people can be reinfected many times with the bacteria that cause the disease. Lauree Feldman/Getty Creative Images hide caption

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Recurring Lyme Disease Rash Caused By Reinfection, Not Relapse
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Bacteroides species are some of the most common bacteria in the human gut. Enviornmental Health Perspectives hide caption

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Thriving Gut Bacteria Linked To Good Health
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