Researchers use DNA from ancient tooth tartar to chart changes in the bacterial communities that have lived in human mouths for 8,000 years.
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Mice fed a mix of six strains of bacteria were able to fight a C. difficile infection that causes deadly diarrhea and is resistant to most types of treatment.
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By cultivating detoxifying bacteria in its gut, a pest called the bean bug can become instantly resistant to a common insecticide.
The theory that people can largely be divided into three groups based on their dominant gut microbiota species is called into question.
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