An imbalance of bacteria and viruses in your airways appears to play an important role in asthma development and severity, according to research reviewed by Gram. Different types of asthma show distinct microbial patterns, people with certain asthma types have fewer diverse microbes and more disease-causing organisms, which may explain why some asthma doesn’t respond to current medications. Scientists are exploring whether treatments targeting these airway microbes, such as probiotics or dietary changes, could become new asthma therapies.
Scientists are discovering that the microscopic bacteria and viruses living in your lungs might play a huge role in asthma. According to Gram Research analysis, an imbalance of these tiny organisms, called dysbiosis, appears connected to how severe asthma becomes and how often attacks happen. Different types of asthma show different patterns of these airway microbes, which could help doctors treat asthma better in the future. Researchers are exploring whether fixing this microbial imbalance through diet, probiotics, or antibiotics could become a new way to control asthma symptoms.
Key Statistics
A 2026 review in Chest found that Haemophilus and Moraxella bacteria, along with rhinovirus and respiratory syncytial virus, are associated with asthma development in children, suggesting early-life microbial exposure influences asthma risk.
Research shows that people with neutrophilic asthma have reduced microbial diversity and higher bacterial loads compared to healthy individuals, a pattern that may explain why this asthma type often resists current biologic medications.
According to a 2026 analysis in Chest, people with eosinophilic asthma maintain higher microbial diversity similar to healthy lungs, while those with neutrophilic asthma show pathogen-dominated microbiome profiles, indicating asthma type correlates with specific microbial patterns.
The Quick Take
- What they studied: How the bacteria, viruses, and fungi living in your airways affect asthma development, severity, and treatment response
- Who participated: This is a comprehensive review article analyzing findings from multiple asthma microbiome studies rather than a single study with participants
- Key finding: An unhealthy balance of airway microbes is linked to worse asthma and more frequent attacks, with different asthma types showing distinct microbial patterns
- What it means for you: Future asthma treatments might focus on rebalancing your airway microbes through diet, probiotics, or targeted medications, though this approach is still being researched and not yet standard care
The Research Details
This is a review article published in the journal Chest that examines all available research about how microorganisms in your airways influence asthma. Rather than conducting a new experiment, the authors analyzed findings from many existing studies to identify patterns and draw conclusions about the airway microbiome’s role in asthma.
The review focuses on three main groups of organisms: bacteria (most studied), viruses like rhinovirus and respiratory syncytial virus, and fungi. The authors examined how these microbes relate to asthma development in children, disease severity in people with established asthma, and different types of asthma inflammation patterns.
The researchers also discussed how scientists are now combining microbiome data with other biological information (called multi-omic approaches) to better understand how your body’s immune system interacts with these airway microbes and to identify new treatment targets.
Review articles are important because they synthesize findings from many studies to reveal the bigger picture. This approach helps identify what we know for certain versus what still needs investigation. Understanding the microbiome’s role in asthma could lead to completely new treatment strategies beyond current medications, potentially helping people whose asthma doesn’t respond well to existing drugs.
This review was published in Chest, a highly respected medical journal focused on lung diseases. The authors appear to have comprehensively examined the current research landscape. However, as a review rather than original research, it synthesizes existing studies which vary in quality and size. The field is still relatively new, meaning some conclusions are preliminary. The authors appropriately note several important unknowns, such as whether microbiome imbalance causes inflammation or results from it.
What the Results Show
Research shows that people with asthma often have an imbalanced mix of microbes in their airways compared to healthy people, a condition called dysbiosis. This imbalance appears connected to how severe asthma is and how often asthma attacks occur. Certain bacteria like Haemophilus and Moraxella, along with specific viruses, have been associated with children developing asthma in the first place.
Interestingly, different types of asthma show different microbial patterns. People with eosinophilic asthma (a type involving certain immune cells) tend to have more diverse microbes similar to healthy lungs. In contrast, people with neutrophilic asthma (involving different immune cells) have less diverse microbes, higher bacterial counts, and more disease-causing organisms. This suggests the type of inflammation in your asthma might be connected to your airway microbiome composition.
The neutrophilic asthma pattern is particularly important because it’s often resistant to newer biologic medications that work well for other asthma types. This finding suggests that targeting the microbiome might help people whose asthma doesn’t respond to current treatments.
Researchers are increasingly using advanced techniques that examine multiple biological systems together, combining microbiome data with immune system markers and other body chemicals, to better understand how asthma develops and to identify new treatment possibilities.
The review highlights that viruses and fungi in the airways deserve more research attention. Most studies have focused on bacteria, but respiratory viruses appear to play a role in asthma development. Additionally, the review notes that the gut microbiome (bacteria in your digestive system) may also influence asthma, suggesting that treatments targeting gut bacteria could potentially help lung health.
This review builds on growing evidence over the past decade that the microbiome influences asthma. Earlier research established that microbiome composition differs between people with and without asthma. This review advances that understanding by connecting specific microbial patterns to asthma severity, treatment response, and different asthma subtypes, a more detailed picture than previously available.
The review identifies several important gaps in current knowledge. First, scientists still don’t know whether microbiome imbalance causes asthma inflammation or whether asthma inflammation creates the imbalance: it could work both ways. Second, most research has focused on bacteria; viruses and fungi need more study. Third, the review notes that microbiome studies vary widely in methods and quality, making it difficult to compare results across studies. Finally, while the review discusses potential treatments like probiotics and antibiotics, actual clinical evidence for these approaches in asthma is still limited.
The Bottom Line
Current evidence suggests that maintaining a healthy airway microbiome may be important for asthma control, but specific treatment recommendations aren’t yet established. Researchers are investigating whether diet changes, probiotics, and targeted antibiotics could help rebalance the airway microbiome. If you have asthma, continue following your doctor’s current treatment plan while staying aware that microbiome-based treatments may become available in the future. Discuss any interest in experimental microbiome therapies with your healthcare provider.
Anyone with asthma should find this research interesting, especially people whose asthma doesn’t respond well to current medications. Parents of children with asthma may want to follow this research, as the microbiome appears important in asthma development. Healthcare providers treating asthma should be aware of this emerging field. People without asthma don’t need to take action based on this review, though maintaining overall respiratory health through good hygiene and avoiding infections remains important.
Microbiome-based asthma treatments are still in research phases. It will likely take several years of clinical trials before new microbiome-targeted therapies become available to patients. In the meantime, current asthma medications remain the most proven approach to controlling symptoms and preventing attacks.
Frequently Asked Questions
Can probiotics help treat asthma by fixing my airway microbiome?
Probiotics are theoretically promising for asthma based on microbiome research, but clinical evidence is still limited. While scientists are investigating whether probiotics could help rebalance airways, they’re not yet standard asthma treatment. Discuss probiotic use with your doctor before trying them.
Does my asthma type affect which bacteria live in my lungs?
Yes. Research shows different asthma types have distinct microbial patterns. Eosinophilic asthma shows diverse microbes like healthy lungs, while neutrophilic asthma has fewer diverse microbes and more disease-causing organisms, suggesting asthma type and airway microbiome composition are connected.
Can viruses in my airways cause asthma to develop?
Certain viruses like rhinovirus and respiratory syncytial virus are associated with asthma development in children, suggesting viral infections may trigger asthma onset. However, most asthma research has focused on bacteria; viruses need more study to understand their exact role.
Why does some asthma not respond to biologic medications?
Research suggests that asthma with neutrophilic inflammation and an imbalanced microbiome may resist current biologic drugs. This finding indicates that targeting the airway microbiome could potentially help people whose asthma doesn’t respond to existing medications.
Will microbiome treatments replace my current asthma medications?
Microbiome-based asthma treatments are still in research phases and not yet available clinically. Continue your current asthma medications as prescribed. Future microbiome therapies may complement existing treatments rather than replace them, but this remains to be determined.
Want to Apply This Research?
- Track asthma symptom patterns (frequency of attacks, peak flow measurements, rescue inhaler use) alongside dietary changes and any probiotic use to identify personal correlations between microbiome-related factors and asthma control
- Users could experiment with documenting their diet quality and any respiratory infections alongside asthma symptoms to identify personal patterns, while discussing microbiome-focused approaches with their doctor
- Establish a baseline of current asthma control metrics, then monitor changes over time if implementing any microbiome-related interventions, comparing symptom frequency and severity month-to-month
This article reviews scientific research about the airway microbiome’s role in asthma but does not constitute medical advice. Microbiome-based asthma treatments discussed are largely experimental and not yet standard clinical care. If you have asthma, continue following your doctor’s treatment recommendations. Do not start, stop, or change asthma medications or try new treatments without consulting your healthcare provider. This review synthesizes existing research; individual study quality varies, and some findings are preliminary. Always discuss new treatment approaches with your doctor before implementation.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.
