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A groundbreaking study led by researchers from the University of Turku, Finland, has uncovered significant differences in gut antibiotic resistance based on gender and country income levels. Published on May 19, 2025, in npj Biofilms and Microbiomes, the research analyzed over 14,600 gut metagenomes from individuals across 32 countries, offering new insights into the global landscape of antibiotic resistance genes (ARGs).
Professor Leo Lahti’s team found that in high-income countries (HICs), women harbor about 9% more antibiotic resistance genes in their gut microbiomes than men. The researchers suggest this may stem from higher antibiotic exposure, increased contact with resistant bacteria, or biological factors that make women more prone to carrying these bacteria. In low- and middle-income countries (LMICs), men showed a higher ARG load than women, though this difference was less pronounced when accounting for age, lifestyle, and environmental factors.
Notably, gender differences in antibiotic resistance patterns were only observed in adults, not in children, indicating that adult behaviors, healthcare access, or biological differences play a more significant role. The study also highlighted that women in high-income countries have a greater variety of resistance genes, reflecting a broader spectrum of antibiotic resistance in their gut bacteria.
Beyond gender, the research found that age and geographic location strongly influence antibiotic resistance. Infants and the elderly exhibited the highest resistance gene loads and diversity, while regions with high antibiotic use—especially in lower-income settings—showed elevated resistance, likely due to poor sanitation, hygiene issues, and antibiotic overuse.
“Understanding gender differences in antibiotic resistance is key to designing equitable and effective healthcare interventions. Our study will lay the groundwork for further research to reduce health inequalities related to antibiotic resistance,” said postdoctoral researcher Katariina Pärnänen.
The findings underscore the need for gender-sensitive and region-specific strategies to address the growing threat of antibiotic resistance globally.
Disclaimer:
This news article is based on a recent scientific study published in npj Biofilms and Microbiomes. The information provided is for general knowledge and awareness purposes only and should not be considered as medical advice. Readers are encouraged to consult healthcare professionals for any concerns related to antibiotic use or resistance. The views expressed in this article are those of the cited researchers and do not necessarily reflect the official policy or position of any institution.
