University of Bergen Researchers Detect Antibiotic Resistance Genes in One Third of Healthy Lungs and Most Respiratory Patients

University of Bergen study finds antibiotic resistance genes in 35% of healthy lungs, with higher rates in sarcoidosis and fibrosis patients.

By: AXL Media

Published: Apr 1, 2026, 10:12 AM EDT

Source: Information for this report was sourced from The University of Bergen

Mapping the Genomic Landscape of the Lower Airway Microbiome

While the presence of antibiotic resistance is often associated with clinical infections, new research from the University of Bergen indicates that these genetic markers are a persistent feature of the human respiratory system. By utilizing bronchoscopy to collect samples from the lower airways, scientists were able to perform shotgun metagenomics, a high resolution sequencing method that maps the entire microbial community. This approach allowed the team to look beyond the mere presence of bacteria and instead focus on the specific genetic properties that allow microbes to survive antibiotic treatment. The findings establish a new baseline for understanding how the lung microbiome serves as a reservoir for resistance, even in individuals who do not currently show signs of illness.

The Unexpected Prevalence of Resistance in Healthy Populations

One of the most striking revelations from the study was the detection of resistance genes in 35 percent of the healthy participants. This discovery challenges the assumption that the lower lungs of healthy people are relatively free of antibiotic resistant markers. First author Guri Kringeland noted that while patients with pulmonary fibrosis and sarcoidosis showed a significantly higher prevalence, the presence of these genes in over a third of the healthy control group suggests that environmental exposure or subtle microbial shifts are more widespread than previously estimated. This data underscores the complexity of the global resistance crisis, as it appears that the genetic potential for resistance is well established in the general population before an infection even occurs.

Correlating Recent Pharmaceutical Use with Microbial Defenses

The research confirmed a direct link between the recent administration of antibiotics and an increase in the volume of resistance genes found within the lungs. This observation aligns with the established medical consensus that the frequent use of antimicrobial drugs is a primary driver of bacterial evolution. In patients with chronic obstructive pulmonary disease and asthma, who often require repeated courses of antibiotics to manage flare ups, the lower airways contained a denser concentration of these defensive genetic markers. Kringeland emphasized that this relationship highlights the urgent need for more precis...