Brown bear scull

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Brown bear scull

Researchers used historical museum collections of Swedish brown bears to follow the effects of human-made antibiotics.
Katerina Guschansk
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Katerina Guschansk
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  • Dental calculus from Swedish brown bears help researchers study antibiotic resistance over time. Credit: Mats Björklund

    History of human antibiotic use written in the oral bacteria of wild brown bears

    An international team of researchers used historical museum collections to study the effects of human-made antibiotics over the entire history of their application. They found that the increased use of antibiotics in medicine and agriculture in the 1950-1990s led to increases in antibiotic resistance in wild Swedish brown bears. However, the latest 20 years show a downward trend in resistance.

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