This is what we know now about post-COVID.
An international team of researchers published a comprehensive review article earlier this year in the journal Communications Medicine – from Nature regarding current knowledge about post-COVID. The article brings together existing scientific insights and discusses which biological processes may play a role in the onset and persistence of symptoms.
This is not a new study, but a review: a scientific overview study in which results from many previous studies are brought together and assessed. Therefore, it does not provide new research data, but rather an up-to-date overview of what researchers currently do and do not know about post-COVID. Below is a summary of the article.
The main message: multiple mechanisms likely play a role.
Post-COVID has grown into a major global health problem. Symptoms such as severe fatigue, brain fog, sleep problems, exercise intolerance, and cognitive problems can persist for months or even longer after a COVID-19 infection. Yet, many questions remain regarding the underlying causes.
One of the key conclusions is that there is likely no single cause that explains all post-COVID symptoms. There are various biological mechanisms that may contribute to the development and persistence of symptoms, such as:
- Disruption of the immune system and persistent inflammatory responses.
- Possible presence of virus particles or viral remnants that remain in the body for a longer period.
- Problems in small blood vessels and disturbances of oxygen supply.
- Disruptions of the autonomic nervous system, which regulates heart rate and blood pressure, among other things.
- Possible neurological changes that may contribute to cognitive complaints such as concentration and memory problems.
These processes may influence each other. As a result, post-COVID can manifest in different ways in different people. And that may explain why patients often experience a wide range of symptoms.
No clear cause yet
Despite the growing body of research, there is currently no scientific consensus on a single underlying cause of post-COVID. The available studies point to various possible mechanisms, but none of them explains all cases.
Post-COVID is therefore described as a complex multisystem disease in which multiple organs and body systems may be involved. It is also possible that different groups of patients have different underlying mechanisms. Therefore, researchers are looking for reliable biomarkers: measurable characteristics that can help diagnose the condition or predict the course of the disease. At present, such biomarkers have not yet been established.
No proven treatment yet
Currently, there is no treatment that has been convincingly demonstrated to cure post-COVID. Various treatment strategies are being investigated, but the evidence is still limited and often inconclusive. Therefore, more research is needed into both the underlying biological mechanisms and potential treatments. Larger studies and long-term follow-up of patients are important in this regard.
What does this mean for patients?
For patients, this review article primarily offers confirmation of something that many researchers have already observed in recent years: post-COVID is a complex physical condition likely involving multiple biological processes.
At the same time, this article changes little in daily practice at this moment. It does not yield a new diagnostic test and does not introduce a new proven treatment. However, it does provide a clear overview of the current state of the science and shows which lines of research are currently considered the most promising.
For patients seeking a clear explanation for their symptoms, this may be disappointing. Nevertheless, the article also shows that a great deal of international research is being conducted into the biological mechanisms behind long COVID. This is important because a better understanding of those mechanisms can ultimately contribute to better diagnostics and treatment. It particularly underscores how much progress has been made in understanding post-COVID, but also how many questions remain unanswered.
