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While antibiotics play a critical role in treating bacterial infections, they may leave a long-term imprint on the gut microbiome. According to new research, even one course of certain antibiotics can alter the gut microbiome, with changes still detectable four to eight years after treatment. Repeated use appears to drive even bigger changes in microbial diversity.
The team identified strong links between prior antibiotic use and changes in gut microbiome composition, including shifts in bacterial diversity. Reduced microbial diversity has been associated with obesity, Type 2 Diabetes, and IBD in prior research. However, emerging evidence suggests that the presence or absence of specific bacterial species, not diversity alone, may be a key factor influencing health. Still, higher overall diversity is generally viewed as advantageous.
The study compared gut microbiome composition in participants exposed to different classes of antibiotics with those who had received none during the study period. Researchers found substantial variation depending on the antibiotic used. For example, the antibiotic clindamycin was linked to changes in nearly 300 bacterial species, while Penicillin V was associated with shifts in only 29.
Researchers noted that the study was limited to antibiotic prescription records from the prior eight years, and longer-term follow-up could reveal additional effects. They also noted that each participant’s gut microbiome was sampled only once, limiting the ability to track changes over time.
The findings suggest antibiotic use may leave a long-lasting, potentially permanent signature on the gut microbiome, underscoring the need for cautious prescribing and long-term gut recovery support.
To view the original scientific study click below:
Antibiotic use and gut microbiome composition links from individual-level prescription data of 14,979 individuals
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