Belgian Scientists Discover Bacteria That May Hold Key to Preventing Long COVID
Researchers at UCLouvain and Saint-Luc University Clinics in Belgium have identified a bacterium, Dolosigranulum pigrum, that appears to offer protection against Long COVID. This groundbreaking discovery, announced on March 17, 2026, opens the door to potential preventative strategies, including a nasal spray.
The Five-Year Journey to Discovery
The study began in 2021, at the height of the COVID-19 pandemic, with the aim of predicting which patients were most likely to develop persistent symptoms. After five years of research, scientists pinpointed the central role of Dolosigranulum pigrum, a bacterium found in the respiratory microbiome – the collection of microorganisms living in the airways.
The presence of this bacterium, when coupled with other bacteria, seems to correlate with a reduced persistence of symptoms associated with Long COVID. Researchers analyzed the severity of Long COVID in 156 patients experiencing fatigue, cognitive impairment, and respiratory difficulties. Simultaneously, they studied molecular signatures linked to severe forms of the illness through blood tests and nasopharyngeal swabs.
How Dolosigranulum pigrum Works
The research suggests that certain bacteria within the respiratory microbiome can promote faster recovery from viral infections like COVID-19, and influenza. Conversely, disruption of this microbiome – particularly through the use of broad-spectrum antibiotics – may increase the risk of persistent symptoms.
When Dolosigranulum pigrum is abundant, it may protect against prolonged illness or severe cases of the flu. A lower presence of the bacterium, however, appears to be associated with a higher risk of developing persistent symptoms.
The Potential of a Nasal Spray
The findings have spurred interest in developing a preventative strategy in the form of a nasal spray. Scientists are currently working on tools to measure the presence of these bacteria in patients’ noses. The next steps involve confirming these results in larger studies, establishing a causal link through animal models, and exploring the feasibility of a nasal spray intervention.
Long COVID: A Continuing Public Health Challenge
Long COVID remains a significant public health concern. In Belgium, approximately 400,000 people – around 4% of the population – continue to suffer from its effects. The condition disproportionately affects women aged 45-54 and is linked to obesity.
Currently, Long COVID management focuses on treating symptoms, such as fatigue and cognitive dysfunction, often through rehabilitation programs. There is currently no specific cure.
Future Trends in Microbiome Research and Respiratory Health
The discovery of Dolosigranulum pigrum’s protective role highlights the growing importance of microbiome research in understanding and combating respiratory illnesses. Several trends are emerging in this field:
Personalized Microbiome Therapies
As our understanding of the microbiome deepens, we can expect to see more personalized therapies tailored to an individual’s unique microbial profile. This could involve customized probiotic formulations or even fecal microbiota transplantation (FMT) for severe cases.
The Rise of “Probiotics” for the Nose
The concept of a “nasal probiotic” – a spray containing beneficial bacteria – is gaining traction. These sprays could be used preventatively, before flu season or during outbreaks, or therapeutically, to restore a healthy microbiome after infection.
Antibiotic Stewardship and Microbiome Preservation
The research underscores the importance of responsible antibiotic use. Overuse of antibiotics can disrupt the microbiome, increasing susceptibility to infections and potentially contributing to Long COVID. Greater emphasis on antibiotic stewardship programs and alternative therapies will be crucial.
Advanced Diagnostic Tools
Developing more accurate and accessible tools for analyzing the respiratory microbiome will be essential for identifying individuals at risk of Long COVID and monitoring the effectiveness of interventions.
Frequently Asked Questions (FAQ)
- What is Long COVID?
- Long COVID refers to persistent symptoms that continue for weeks or months after the initial COVID-19 infection.
- What is the respiratory microbiome?
- The respiratory microbiome is the community of microorganisms that live in the airways, including bacteria, viruses, and fungi.
- Could a nasal spray really prevent Long COVID?
- While promising, this is still under investigation. More research is needed to confirm the effectiveness of a nasal spray containing Dolosigranulum pigrum.
- Are antibiotics always harmful to the microbiome?
- Not always, but broad-spectrum antibiotics can disrupt the balance of the microbiome. It’s important to use antibiotics only when necessary and as prescribed by a doctor.
Want to learn more about respiratory health? Explore our articles on boosting your immune system and the latest advancements in flu prevention.
Share your thoughts! Have you experienced Long COVID? What strategies have you found helpful? Leave a comment below.
