The findings suggest that changes in the oral and lung microbiome could play a role in persistent symptoms like respiratory issues, brain fog, and gastrointestinal problems.
Microbiome Changes Linked to Long COVID Symptoms
Researchers found that individuals with the most severe long COVID symptoms five to six months after infection had significant alterations in their oral and airway microbiome. Dr. James Chalmers, chair of respiratory research at the University of Dundee, noted that these changes were associated not only with lung problems but also with broader health issues like cognitive and digestive symptoms.
The study, involving 771 participants from the PHOSP-COVID research program, assessed health outcomes and microbiome profiles using saliva samples. Those with very severe long COVID exhibited a distinct microbiome population, characterized by a higher prevalence of lactic acid bacteria. These changes were also linked to raised levels of inflammatory proteins in the blood.
Potential Implications for Treatment
For those affected, these findings could mean a shift in how long COVID is understood and treated. If the microbiome plays a key role, interventions like antibiotics or probiotics might offer new ways to manage symptoms, though more research is needed to confirm this.
Next Steps in Long COVID Research
Chalmers emphasized the urgent need to understand the causes of long COVID, which continues to be a significant healthcare challenge. The study’s findings could pave the way for predictive models, preventive measures, and targeted treatments. “We hope our findings will stimulate more research into long COVID,” Chalmers said, adding that future treatment trials could help alleviate the burden of this condition.
Oral and Sputum Microbiome Profiles Linked to Specific Symptoms
Reduced lung function was associated with a distinct oral microbiome profile, while persistent neurocognitive symptoms, including memory and concentration issues, were linked to changes in oral bacteria. Gastrointestinal symptoms were associated with a distinct sputum microbiome profile. These findings suggest that specific microbiome alterations may be connected to particular long COVID symptoms, highlighting the complexity of the condition.
