03/10/2026
https://medlifeguide.com/new-study-reveals-potential-blood-biomarker-for-long-covid-sars-cov-2-fragments-in-extracellular-vesicles/
New Study Reveals Potential Blood Biomarker for Long COVID: SARS-CoV-2 Fragments in Extracellular Vesicles
A groundbreaking July 2025 study published in the journal Infection has provided compelling new evidence supporting the biological basis of long COVID. Researchers detected SARS-CoV-2 protein fragments inside extracellular vesicles (EVs) — tiny, naturally occurring packages in the blood — from patients experiencing persistent symptoms long after their initial COVID-19 infection. This discovery, achieved through advanced mass spectrometry, identified unique viral peptides absent in control samples, positioning these fragments as a potential objective diagnostic biomarker for long COVID.
A 2025 study in Infection journal detects SARS-CoV-2 protein fragments in extracellular vesicles from long COVID patients' blood via mass spectrometry — a potential game-changing biomarker for diagnosis. Learn how this could validate symptoms and guide future treatments.