Nature Immunology: 'LC-Mo' Immune Cell Identified as Long COVID Mechanism

Researchers at the Helmholtz Centre for Infection Research published findings in Nature Immunology identifying 'LC-Mo' — a distinct state of CD14+ monocyte white blood cells — linked to Long COVID fatigue, brain fog, and pulmonary impairment. The cells persist in patients who had mild-to-moderate acute infections, providing a potential biological explanation for why an estimated 65 million people globally continue experiencing symptoms 12+ weeks after infection. The discovery opens pathways for targeted immunomodulatory therapies. The NIH's RECOVER initiative simultaneously reported results from multiple clinical trials testing Long COVID treatments.