A hidden physical change in the body may be helping to drive the prolonged malaise some people experience after contracting COVID-19 .

Analyzing blood samples from patients with long COVID , a team of medical researchers has identified unusual microscopic structures that may contribute to symptoms such as brain fog and fatigue . If this is the case, it offers a hopeful target for future treatment.

"This study shows a robust association between biomarkers indicative of thromboinflammatory activity and long COVID," the team writes in a paper led by geneticist Alain Thierry of Montpellier University in France.

"The discovery of these biomarker linkages not only presents a possible novel diagnostic methodology but also novel therapeutic targets, offering prospects for future marke

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