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American Focus > Blog > Health and Wellness > Bad in small doses—how misuse of antibiotics contributes to bacterial drug resistance
Health and Wellness

Bad in small doses—how misuse of antibiotics contributes to bacterial drug resistance

Last updated: February 6, 2025 12:39 pm
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Bad in small doses—how misuse of antibiotics contributes to bacterial drug resistance
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Antibiotic resistance is a growing concern in the field of healthcare and medicine, posing a significant threat to global public health. A recent study conducted by researchers at the John Innes Centre shed light on how bacteria develop resistance to multiple drugs, particularly in response to low doses of quinolone antibiotics. Quinolones are a class of antibiotics that target the enzyme DNA gyrase in bacteria, essential for their survival.

The research team, led by Professor Tony Maxwell, aimed to investigate the phenomenon of Quinolone-induced antibiotic resistance (QIAR) and identify which types of quinolones were involved. Their experiments involved exposing E. coli bacteria to non-lethal concentrations of four different quinolones and then challenging the bacterial colonies with non-quinolone antibiotics. The results revealed that all tested quinolones, except for moxifloxacin, exhibited QIAR.

Further analysis through whole genome sequencing showed that the resistance in bacteria was due to mutations induced by the quinolone treatment. Interestingly, moxifloxacin appeared to kill E. coli through a different mechanism compared to other quinolones. These findings have significant implications for understanding the physiological mechanisms behind multidrug resistance in bacteria and highlight the importance of avoiding low doses of quinolones to prevent resistance development.

Professor Tony Maxwell emphasized the need to address the misuse and overuse of antibiotics, whether in human medicine, agriculture, or pharmaceutical industry practices. Antimicrobial resistance is a natural process that has been accelerated by the inappropriate use of antimicrobials, posing a grave threat to public health. If left unchecked, antimicrobial resistance could lead to 10 million deaths per year and cost the global economy trillions of dollars by 2050.

See also  Cancer cases shifting to younger people and women, report finds

The World Health Organization has identified antibiotic stewardship and research and development as crucial components in combating antimicrobial resistance. It is essential for healthcare professionals, policymakers, and the public to work together to address this pressing issue and ensure the continued efficacy of antibiotics in fighting bacterial infections. More research and awareness are needed to develop effective strategies for preserving the effectiveness of antimicrobial drugs in the face of evolving bacterial resistance.

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