Nature Communications has published a research review entitled ‘Current status and future perspectives on the mechanistic and pathophysiological understanding of Long Covid' (Faghy et al 2026) and Dr Charles Shepherd has provided his comments on this article (below).
Abstract
Background
Viral and infectious illnesses can exert profound and enduring effects on population health and well-being. In the aftermath of SARS-CoV-2 infection, post-acute sequelae, collectively referred to as Long COVID, have emerged as a major global health challenge, affecting more than 400 million people and contributing to estimated annual economic costs exceeding $1 trillion.
Scope of the review
Long COVID encompasses a wide and heterogeneous spectrum of debilitating symptoms, including cognitive dysfunction, sleep disturbances, severe fatigue, and post-exertional malaise. Despite its substantial burden, fundamental uncertainties remain regarding its underlying pathophysiology, the development of robust diagnostic criteria, and the identification of effective therapeutic options.
Key insights
This review synthesises current evidence on the biological mechanisms thought to contribute to Long COVID, spanning immune dysregulation, viral persistence, autonomic dysfunction, microvascular pathology, and other emerging hypotheses. We examine advances and limitations in contemporary diagnostic approaches and critically appraise existing treatment strategies, highlighting inconsistencies and gaps that hinder clinical consensus.
Implications
By integrating interdisciplinary insights, this review underscores the urgent need for mechanistic clarity, validated diagnostic frameworks, and rigorously evaluated treatment pathways. Addressing these gaps will be essential to developing effective, evidence-based management strategies and mitigating the long-term impact of Long COVID on global health.
MEA Comment
This is a very comprehensive and up to date review of our current knowledge and understanding of the various factors that may be involved in the causation of Long Covid, how they may be linked, the symptoms they produce, and the overlaps between Long Covid and ME/CFS.
There is also some discussion on the treatment strategies that are now being investigated for Long Covid and which are linked to these abnormal research findings.
Dr Charles Shepherd,
Trustee and Hon. Medical Adviser to the ME Association,
Member of the 2018-2021 NICE guideline on ME/CFS committee,
Member of the 2002 Chief Medical Officer's Working Group on ME/CFS
