Research – active HHV-6 & EBV infection found in ME/CFS

Active viruses found in people with ME/CFS

 

Fluorescence microscope

A German US collaboration examined tissue from the bodies of people who had had ME/CFS. They found active infection from Human herpes virus (HHV) and Epstein Barr Virus (EBV) in various regions of the human brain and associated tissues including the spinal cord, that is only detected in ME/CFS patients and not in controls. This would have been difficult to find when they were alive.

We hypothesized that it is not the latency itself but a timely, regionally restricted viral reactivation in a sub-set of host cells that plays a key role in disease development.

 

Tissue specific signature of HHV-6 infection in ME/CFS, by  Francesca Kasimir, Danny Toomey, Zheng Liu, Agnes C Kaiping, Maria Eugenia Ariza, Bhupesh K Prusty in Front Mol Biosci. 2022 Dec 14;9:1044964 [doi:10.3389/fmolb.2022.1044964]

Research abstract:

First exposure to various human herpesviruses (HHVs) including HHV-6, HCMV and EBV does not cause a life-threatening disease. In fact, most individuals are frequently unaware of their first exposure to such pathogens. These herpesviruses acquire lifelong latency in the human body where they show minimal genomic activity required for their survival.

We hypothesized that it is not the latency itself but a timely, regionally restricted viral reactivation in a sub-set of host cells that plays a key role in disease development.

HHV-6 (HHV-6A and HHV-6B) and HHV-7 are unique HHVs that acquire latency by integration of the viral genome into sub-telomeric region of human chromosomes.

HHV-6 reactivation has been linked to Alzheimer’s Disease, Chronic Fatigue Syndrome, and many other diseases. However, lack of viral activity in commonly tested biological materials including blood or serum strongly suggests tissue specific localization of active HHV-6 genome.

Here in this paper, we attempted to analyze active HHV-6 transcripts in postmortem tissue biopsies from a small cohort of ME/CFS patients and matched controls by fluorescence in situ hybridization using a probe against HHV-6 microRNA (miRNA), miR-aU14.

Our results show abundant viral miRNA in various regions of the human brain and associated neuronal tissues including the spinal cord that is only detected in ME/CFS patients and not in controls.

Our findings provide evidence of tissue-specific active HHV-6 and EBV infection in ME/CFS, which along with recent work demonstrating a possible relationship between herpesvirus infection and ME/CFS, provide grounds for renewed discussion on the role of herpesviruses in ME/CFS.

see also:  Epstein Barr virus found in ME/CFS

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ME/CFS & Post-COVID Syndrome: a common neuroimmune ground

ME/CFS and Post-COVID syndrome – close relationship

 

Russian researchers analysed the wide range of symptoms in people with ME/CFS and in those with long COVID, many of  whom met the criteria for ME/CFS. The symptoms fell into the categories of PEM, immune dysfunction and disorder of the nervous system, leading them to agree with “the concept of ME/CFS as a disease with neuroimmune pathogenesis”.

Lab tests also found a reduction in blood circulation in the smallest blood vessels which affect blood pressure and responses to inflammation. In addition anxiety and depressive symptoms were no more common in patients with ME/CFS and healthy individuals.

Conclusions

  1. Among patients with symptoms persisting for more than 12 weeks after recovery from acute COVID-19, 100% of individuals met the diagnostic criteria for ME/CFS, which confirms the presence of a close relationship between post-COVID syndrome and ME/CFS.
  2. We found a statistically significant positive relationship between fatigue that does not get better with adequate rest and 20 other symptoms of ME/CFS related to the domains of “post-exertional exhaustion” (7 symptoms), “immune dysfunction” (4 symptoms), “sleep disturbances” (4 symptoms), “dysfunction of the autonomic nervous system” (2 symptoms), “neurological sensory/motor disorders” (2 symptoms), and “pain syndromes” (1 symptom). These data not only agree with the concept of ME/CFS as a disease with neuroimmune pathogenesis but also allow us to make assumptions about the approaches to the diagnosis, treatment, and organization of care for patients with ME/CFS. This confirms the validity of the [EUROMENE] treatment approach to ME/CFS… to reduce the severity of fatigue, patients are provided first of all with symptomatic help to normalize sleep and combat pain.
  3. There was no correlation between anxiety/depressive symptoms and the severity of fatigue in ME/CFS. This can indirectly show that fatigue in ME/CFS is not a consequence of primary mental disorders.
  4. Immune dysfunction was detected in 12/12 patients with ME/CFS (100%) based on the analysis of the results of the laboratory screening immunological evaluation.
  5. The prevalence of POTS in patients with ME/CFS, especially with ME/CFS of the post-COVID-19 nature, is high. Still, POTS in this group of patients can be difficult to diagnose due to its delayed occurrence in the active orthostatic test.
  6. Changes in microcirculation in ME/CFS (including ME/CFS of the post-COVID-19 nature) identified with the LDF method correspond to the hyperemic form of microcirculation disorders which is generally observed in acute inflammatory response or in case of the systemic vasoconstriction failure. It seems that increased vascular resistance may occur later in the disease course due to the chronic inflammatory process.

Myalgic Encephalomyelitis/Chronic Fatigue Syndrome and Post-COVID Syndrome: A Common Neuroimmune Ground?, by Varvara A Ryabkova, Natalia Y Gavrilova, Tamara V Fedotkina, Leonid P Churilov, Yehuda Shoenfeld in Diagnostics (Basel). 2022 Dec 26;13(1):66 [doi: 10.3390/diagnostics13010066]

Research abstract:

Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a debilitating chronic disease of unknown etiology, sharing a similar clinical presentation with the increasingly recognized post-COVID syndrome.

We performed the first cross-sectional study of ME/CFS in a community population in Russia. Then we described and compared some clinical and pathophysiological characteristics of ME/CFS and post-COVID syndrome as neuroimmune disorders.

Of the cohort of 76 individuals who suggested themselves as suffering from ME/CFS, 56 were diagnosed with ME/CFS by clinicians according to ≥1 of the four most commonly used case definitions.

Of the cohort of 14 individuals with post-COVID-19 syndrome, 14 met the diagnostic criteria for ME/CFS. The severity of anxiety/depressive symptoms did not correlate with the severity of fatigue either in ME/CFS or in post-COVID ME/CFS.

Still, a positive correlation was found between the severity of fatigue and 20 other symptoms of ME/CFS related to the domains of “post-exertional exhaustion”, “immune dysfunction”, “sleep disturbances”, “dysfunction of the autonomic nervous system”, “neurological sensory/motor disorders” and “pain syndromes”.

Immunological abnormalities were identified in 12/12 patients with ME/CFS according to the results of laboratory testing. The prevalence of postural orthostatic tachycardia assessed in the active orthostatic test amounted to 37.5% in ME/CFS and 75.0% in post-COVID ME/CFS (the latter was higher than in healthy controls, p = 0.02). There was a more pronounced increase in heart rate starting from the 6th minute of the test in post-COVID ME/CFS compared with the control group.

Assessment of the functional characteristics of microcirculation by laser doppler flowmetry revealed obvious and very similar changes in ME/CFS and post-COVID ME/CFS compared to the healthy controls. The identified laser doppler flowmetry pattern corresponded to the hyperemic form of microcirculation disorders usually observed in acute inflammatory response or in case of systemic vasoconstriction failure.

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Neuro Cafe, Aberystwyth 30 January 2023

Ceredigion neuro cafe

 

A get together for people affected by neurological conditions.

At Plas Antaron, Aberystwyth, SY23 1SF

11-1pm, 30 January, 27 February, 27 March 2023

Contact admin@hahav.org.uk  01970 611550

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Research: Muscle sodium overload in patients with ME/CFS

Muscle sodium content in patients with ME/CFS

 

A German team of researchers used magnetic resonance imaging (MRI) to measure levels of sodium in the tissues of the legs of people with ME/CFS and healthy people. Too much sodium can lead to muscle weakness. Too little can trigger spasms and cramping.

 

“This study provides evidence that sodium content of lower leg muscles is higher in ME/CFS than in healthy controls at rest and after exercise. Furthermore, our findings indicate an inverse correlation between mean muscle sodium content and handgrip strength. Thus, sodium overload may play a role in the pathophysiology of ME/CFS and may allow for potential treatment targeting.

This study demonstrates the feasibility of monitoring changes in muscle sodium content in ME/CFS and healthy subjects after exercise using 23Na-MRI.”

More information:

Muscle sodium content in patients with Myalgic Encephalomyelitis/ Chronic Fatigue Syndrome, by Elisabeth Petter, Carmen Scheibenbogen, Peter Linz, Christian Stehning, Klaus Wirth, Titus Kuehne, Marcus Kelm in Journal of Translational Medicine Vol 20, #1, p 580 December 9, 2022

Research abstract:

Background: Muscle fatigue and pain are key symptoms of Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS). Although the pathophysiology is not yet fully understood, there is ample evidence for hypoperfusion which may result in electrolyte imbalance and sodium overload in muscles.

Therefore, the aim of this study was to assess levels of sodium content in muscles of patients with ME/CFS and to compare these to healthy controls.

Methods: Six female patients with ME/CFS and six age, BMI and sex matched controls underwent 23Na-MRI of the left lower leg using a clinical 3T MR scanner before and after 3 min of plantar flexion exercise. Sodium reference phantoms with solutions of 10, 20, 30 and 40 mmol/L NaCl were used for quantification.

Muscle sodium content over 40 min was measured using a dedicated plugin in the open-source DICOM viewer Horos. Handgrip strength was measured and correlated with sodium content.

Results: Baseline tissue sodium content was higher in all 5 lower leg muscle compartments in ME/CFS compared to controls. Within the anterior extensor muscle compartment, the highest difference in baseline muscle sodium content between ME/CFS and controls was found (mean p/m SD; 12.20 p/m 1.66 mM in ME/CFS versus 9.38 p/m 0.71 mM in controls, p=0.0034).

Directly after exercise, tissue sodium content increased in gastrocnemius and triceps surae muscles with + 30% in ME/CFS (p=0.0005) and + 24% in controls (p=0.0007) in the medial gastrocnemius muscle but not in the extensor muscles which were not exercised. Compared to baseline, the increase of sodium content in medial gastrocnemius muscle was stronger in ME/CFS than in controls with + 30% versus + 17% to baseline at 12 min (p=0.0326) and + 29% versus + 16% to baseline at 15 min (p=0.0265). Patients had reduced average handgrip strength which was associated with increased average muscle tissue sodium content (p=0.0319, R2=0.3832).

Conclusion: Muscle sodium content before and after exercise was higher in ME/CFS than in healthy controls. Furthermore, our findings indicate an inverse correlation between muscle sodium content and handgrip strength. These findings provide evidence that sodium overload may play a role in the pathophysiology of ME/CFS and may allow for potential therapeutic targeting.

Dr Katrina Pearce comments on the MEA website:

  • People with ME/CFS are often advised to increase their sodium/salt intake to help with orthostatic intolerance, however, findings in this study would not be due to this as the differences are too large and excess sodium is excreted by the kidneys. Therefore, a lower dietary intake would not change the results.
  • In conclusion, there are some very clear significant findings in this study on a very small sample size, however,  more investigation is needed to explain these results, especially if potential treatments targeting the high sodium muscle content are to be considered.

Read more

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#WAMES_800 fundraising journey boost

£300 in donations – approaching our goal!

 

A BIG thank you is due to 3 people in West Wales who have donated £300 between them to keep WAMES ‘Working for ME in Wales‘!

This is a big boost for the team currently engaged in negotiations with health boards to improve services for people with ME. It is encouraging to know people are keen to support this effort and ensure it continues.

Find out more about our Fundraising Journey:

#WAMES_800 fundraising journey – Join us! 

How to get free donations for WAMES – online shopping

#WAMES_800 Fundraising volunteers needed! 

#WAMES_800 – How can I donate?

#WAMES_800 Fundraising – donate with PayPal & eBAY

#WAMES_800 – Donations ‘In lieu of gifts’

Send a Christmas e-card & donate to WAMES

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Hypothesis: Multisystemic dyshomeostasis (faulty thermostat theory) in ME/CFS & PASC

Converging evidence of similar symptomatology of ME/CFS and PASC

 

A review article by independent researcher David Marks looks at the overlap in symptoms between ME/CFS and Long COVID and makes a speculative hypothesis about biological mechanisms.

Conclusions:

(1) The pattern of symptoms for ME/CFS and PASC is highly similar. Using a psychometrically reliable and validated measure, the correlation in mean symptom scores across 62 symptoms is 0.902.

(2) The waxing and waning of ME/CFS and PASC symptomatology require an explanatory hypothesis that includes a mechanism that can stabilize and destabilize in unpredictable, intermittent cycles. It is suggested that ME/CFS and PASC are the consequence of central nervous system dyshomeostasis. The hypothesis receives tentative support from a variety of sources.


(3) The theory is consistent with the ‘Energy Envelope’ theory, research on organ network interactions, and hypotheses concerning molecular mechanisms of neuroinflammation in ME/CFS and PASC.

To use an analogy of a thermostat, if the ‘off switch’ of a thermostat intermittently stops working, for periods the house would become warmer and warmer without limit.

(4) The current theory is speculative and requires in-depth investigation before definite conclusions can be drawn. Further study of mechanisms and functional studies should improve understanding of the associations between these hypotheses and etiological factors.

Converging evidence of similar symptomatology of ME/CFS and PASC indicating multisystemic dyshomeostasis, by David Marks in Biomedicines 2023, 11(1), 180 [doi.org/10.3390/biomedicines11010180]

(This article belongs to the Special Issue Feature Review Papers on Brain Diseases)

Review abstract:

The purpose of this article is to review the evidence of similar symptomatology of myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) and post-acute sequelae of SARS-CoV-2 infection (PASC).

Reanalysis of data from a study by Jason comparing symptom reports from two groups of ME/CFS and PASC patients shows a notably similar symptomatology. Symptom scores of the PASC group and the ME/CFS group correlated 0.902 (p < 0.0001) across items.

The hypothesis is presented that ME/CFS and PASC are caused by a chronic state of multisystemic disequilibrium including endocrinological, immunological, and/or metabolic changes. The hypothesis holds that a changed set point persistently pushes the organism towards a pathological dysfunctional state which fails to reset.

To use an analogy of a thermostat, if the ‘off switch’ of a thermostat intermittently stops working, for periods the house would become warmer and warmer without limit.

The hypothesis draws on recent investigations of the Central Homeostasis Network showing multiple interconnections between the autonomic system, central nervous system, and brain stem. The hypothesis helps to explain the shared symptomatology of ME/CFS and PASC and the unpredictable, intermittent, and fluctuating pattern of symptoms of ME/CFS and PASC.

The current theoretical approach remains speculative and requires in-depth investigation before any definite conclusions can be drawn.

 

 

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Research review: What causes ME/CFS: The role of the dysfunctional immune system & viral infections

Is the immune dysregulation hypothesis proven?

 

A European team led by Dr Amolak Bansal review a number of areas of research into ME/CFS before concluding:

“After over 20 year of attempting to identify specific immune defects and infectious agents that cause ME/CFS, clear pathways are still not evident. However, a complex interaction between the immune system and viruses/retroviruses is now emerging and manifesting subtle changes in cytokines, NK
cells and T cells which directly or via autoimmunity may be responsible for the plethora of symptoms seen in ME/CFS.

Combined with immune and pathogen-induced mitochondrial dysfunction now being dissected by several research groups it
is quite possible that it will gain real insight into the cause of this enigmatic and highly disabling illness.”

 

What Causes ME/CFS: The Role of the Dysfunctional Immune System and Viral Infections, by Amolak S Bansal, Aletta D Kraneveld, Elisa Oltra and Simon Carding, in Journal of Immunology and Allergy 2022;3(2):1-15

Review abstract:

Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) remains an enigmatic highly disabling and complex long-term condition with a wide range of aetiologies and symptoms.

A viral onset is commonly mentioned by patients and several bodily systems are ultimately disturbed. The parallel with long-covid is clear.

However, immune dysregulation with impaired NK cell dysfunction and tendency to novel autoimmunity have been frequently reported. These may contribute to reactivation of previous acquired viruses/retroviruses accompanied by impaired endocrine regulation and mitochondrial energy generation.

The unpredictable nature of seemingly unconnected and diverse symptoms that are poorly responsive to several allopathic and alternative therapies then contributes to an escalation of the illness with secondary dysfunction of multiple other systems.

Treatment of established ME/CFS is therefore difficult and requires multi-specialty input addressing each of the areas affected by the illness.

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Research review-Long COVID increases the risk of several conditions including ME/CFS

Long COVID: major findings, mechanisms and recommendations

 

A US review of long COVID research finds it affects 65m people+. Both COVID-19 and long COVID increase the risk of several medical conditions, including ME & POTS.

“Long COVID is a multisystemic illness encompassing ME/CFS, dysautonomia, impacts on multiple organ systems, and vascular and clotting abnormalities. It has already debilitated millions of individuals worldwide, and that number is continuing to grow.

On the basis of more than 2 years of research on long COVID and decades of research on conditions such as ME/CFS, a significant proportion of individuals with long COVID may have lifelong disabilities if no action is taken.

Diagnostic and treatment options are currently insufficient, and many clinical trials are urgently needed to rigorously test treatments that address hypothesized underlying biological mechanisms, including viral persistence, neuroinflammation, excessive blood clotting and autoimmunity.”

Long COVID: major findings, mechanisms and recommendations, by Hannah E Davis, Lisa McCorkell, Julia Moore Vogel & Eric J Topol in Nature Reviews Microbiology, 13 January 2023

Review abstract:

Long COVID is an often debilitating illness that occurs in at least 10% of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infections.

More than 200 symptoms have been identified with impacts on multiple organ systems. At least 65 million individuals worldwide are estimated to have long COVID, with cases increasing daily.

Biomedical research has made substantial progress in identifying various pathophysiological changes and risk factors and in characterizing the illness; further, similarities with other viral-onset illnesses such as myalgic encephalomyelitis/chronic fatigue syndrome and postural orthostatic tachycardia syndrome have laid the groundwork for research in the field.

In this Review, we explore the current literature and highlight key findings, the overlap with other conditions, the variable onset of symptoms, long COVID in children and the impact of vaccinations. Although these key findings are critical to understanding long COVID, current diagnostic and treatment options are insufficient, and clinical trials must be prioritized that address leading hypotheses.

Additionally, to strengthen long COVID research, future studies must account for biases and SARS-CoV-2 testing issues, build on viral-onset research, be inclusive of marginalized populations and meaningfully engage patients throughout the research process.

“To ensure an adequate response to the long COVID crisis, we need research that builds on existing knowledge and is inclusive of the patient experience, training and education for the health-care and research workforce, a public communication campaign, and robust policies and funding to support research and care in long COVID.”

In the media:

Medical express: Research review suggests long COVID may last indefinitely for some people and mimic other ailments

News-Medical: What are the major findings of long COVID research?

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CFS/ME in adolescents: Practical guidance & management challenges

Practical guidance and management challenges of ME/CFS in adolescents

Australian paediatrician Dr Katherine Rowe has written a paper for practitioners, based on her own experience, which reviews the current understanding of ME/CFS and highlights effective management strategies for adolescents.

As ME/CFS disrupts educational, emotional, social and physical activities in addition to the symptoms, she says it is important to not only manage symptoms but also provide strategies for coping with its effect on the young person and the family.

A self-management plan

should be devised in partnership with the young patient, to include some:

  • proactive social contact
  • academic input
  • physical activity and
  • commitment to attend something enjoyable outside of home on a regular basis.

“They were not to leave any of these activities out, but there did not need to be an equal emphasis and some activities could incorporate several aspects, for example, social and academic, or social and enjoyable.

It was important to plan these activities so that they did not precipitate excessive post-exertional malaise and adequate time for recovery was allowed.

These tasks were to be balanced over a week taking into account their available energy. Hence, they needed to be able to sustain those weekly activities over the month before reviewing the plan and increasing some activity if they thought it was achievable. Otherwise, they would consider it the following month.”

Symptom management

“Only the most severe one or two symptoms were treated initially. Young people reported that that the importance of understanding their illness and having some control over their choices had helped with the severity of some symptoms.

Also, treating one symptom such as sleep disturbance can reduce the severity of others. Difficulties with sleep initiation, frequent waking and disturbing nightmares or sleep phase shift can be actively managed with sleep hygiene techniques and melatonin or low dose tricyclic medications such as dothiepin or amitriptyline.

If orthostatic intolerance was identified, fatigue, feelings of anxiety, concentration difficulties, complaints of headache, malaise, dizziness, nausea or sleep disturbance could be improved with simple measures.

These included increasing salt and fluid intake, compression stockings and encouraging lower limb exercises and gentle exercise. Orthostatic intolerance has been shown to be associated with reduced blood flow to the brain, so management to stabilize the disorder can reduce the severity of cognitive symptoms.

If non-pharmacological management was not sufficient, medications to modify heart rate and blood pressure were added and physical therapy introduced to increase lower limb muscle tone. Supervised gradual introduction of gentle exercise to improve cardiac reconditioning may initially be in a reclined position and then as tolerated using more upright posture.”

Read more in:

Chronic Fatigue Syndrome/Myalgic Encephalomyelitis (CFS/ME) in Adolescents: Practical Guidance and Management Challenges, by K Rowe in Adolesc Health Med Ther, Vol 2023:14 Pages 13—26 [doi.org/10.2147/AHMT.S317314]

Abstract:

This paper reviews the current understanding of myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), and whether any treatment strategies have been effective.

ME/CFS is a condition of as yet unknown etiology that commonly follows an infective process. It includes a new onset of fatigue (of more than 3– 6 month duration and not relieved by rest), post-exertional malaise, cognitive difficulties and unrefreshing sleep, and frequently orthostatic intolerance, somatic symptoms and pain.

Long COVID has renewed interest in the condition and stimulated research with findings suggestive of a multisystem neuroimmune disease. There are no definitively effective treatments. Despite earlier recommendations regarding graded exercise therapy and cognitive behavior therapy, the current recommendations are managing symptoms, with lifestyle management and supportive care.

This paper provides an outline of strategies that young people and their families have reported as helpful in managing a chronic illness that impacts their life socially, physically, emotionally, cognitively and educationally. As the illness frequently occurs at a time of rapid developmental changes, reducing these impacts is reported to be as important as managing the physical symptoms.

Young people face a mean duration of 5 years illness (range 1– 16 years) with a likely residual 20% having significant restrictions after 10 years. Their feedback has suggested that symptom management, self-management strategies, advocacy and educational liaison have been the most helpful.

They value professionals who will listen and take them seriously, and after excluding alternative diagnoses, they explain the diagnosis, are supportive and assist in monitoring their progress.

Remaining engaged in education was the best predictor of later functioning. This allowed for social connections, as well as potential independence and fulfilling some aspirations. The need to consider the impact of this chronic illness on all aspects of adolescent development, as part of management, is highlighted.

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Research: ME/CFS & PEM found in many with Long COVID

ME/CFS and Post-Exertional Malaise among patients with long COVID

 

Prof Leonard Jason and Joseph Dorri found 58% of 465 long COVID patients met the criteria for ME/CFS, confirming the findings of previous research.

 

Research abstract:

This study sought to ascertain the prevalence of Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) among a sample of 465 patients with Long COVID.

The participants completed three questionnaires:

  1. a new questionnaire measuring both the frequency and severity of 38 common symptoms of COVID and Long COVID,
  2. a validated short form questionnaire assessing ME/CFS, and
  3. a validated questionnaire measuring post-exertional malaise.

The population was predominantly white, female, and living in North America. The mean duration since the onset of COVID-19 symptoms was 70.5 weeks.

Among the 465 participants, 58% met a ME/CFS case definition.

Of respondents who reported that they had ME/CFS only 70.57% met criteria for ME/CFS and of those who did not report they had ME/CFS, 29.43% nevertheless did meet criteria for the disease: both over-diagnosis and under-diagnosis were evident on self-report.

“it is not sufficient to just ask patients whether or not they have ME/CFS, as most have no idea of what symptoms are in the established ME/CFS case definitions”

This study supports prior findings that ME/CFS occurs with high prevalence among those who have persistent COVID-19 symptoms.

Excerpt from Discussion:

Those COVID-19 patients who meet ME/CFS criteria were more symptomatic on all COVID-19 symptoms. It is a tautology to show that ME/CFS symptoms were more common in people diagnosed with ME/CFS, but more importantly, it is interesting that some Long COVID symptoms (e.g., loss of or change in smell and/or taste) also were more frequent and severe in people who met diagnostic criteria for ME/CFS.

ME/CFS and Post-Exertional Malaise among Patients with Long COVID, by Leonard A Jason, Joseph A Dorri in Neurology International Vol 15, #1, pp 1-11, 20 December 2022 [10.3390/neurolint15010001 ]

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