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Bacteria, Not Fungus, Found to Be Key Culprit in Auto-Brewery Syndrome, Study Confirms

Published January 26, 2026, 13:15
Bacteria, Not Fungus, Found to Be Key Culprit in Auto-Brewery Syndrome, Study Confirms

A new study confirms that bacteria, not fungus, are the primary cause of Auto-Brewery Syndrome (ABS), a rare condition in which patients experience symptoms of intoxication without consuming alcohol. The research, based on the analysis of stool samples from 22 patients and their family members, identified two specific bacterial species in higher concentrations in individuals with ABS. ABS is a rarely diagnosed condition, often overlooked by doctors, leading to patients being wrongly labeled as alcoholics. The increased production of ethanol by bacteria in the gut causes symptoms of intoxication, liver damage, and serious social and legal problems. The study identified the bacteria Klebsiella pneumoniae and Escherichia coli as key contributors to ethanol production. In one notable case, a patient experienced significant improvement after a fecal microbiota transplant from a healthy donor, remaining in remission for over 16 months. The findings suggest that treating ABS may involve modifying the gut microbiome, however, further research is needed to develop effective therapeutic strategies.