An update on Long COVID
Gary Grohmann A B * and Robert Booy B CA
B
C
Gary Grohmann BSc(Hons) PhD FASM (right) is a consultant virologist and a Director of Environmental Pathogens P/L, as well as a Board Member, and member of the Scientific Advisory Committee, of the Immunisation Coalition. He is an Adjunct Professor in Infectious Diseases and Immunology at The University of Sydney. He was Head of Immunobiology at the Therapeutic Goods Administration for 17 years and then a consultant to the World Health Organization on influenza and COVID‐19 matters for 7 years. |
Robert Booy MBBS, MSc, MD, FRACP, FRCPCH (left) is a Senior Professorial Fellow, Children’s Hospital at Westmead School of Child and Adolescent Health, University of Sydney. He has over 300 publications and has supervised 30 doctoral students. Robert has a long-term interest in the control and prevention of serious infectious diseases. He was a Board Member of the Immunisation Coalition for 12 years and still serves on its Scientific Advisory Committee as Chair. |
Abstract
‘Long COVID’ is a major dilemma, difficult to diagnose and even more challenging to treat. Millions are still being affected globally and ~10% of people experience Long COVID following acute infection. Many complain about fatigue, brain fog and mental difficulties, and ~200 symptoms are described making diagnosis difficult. Both acute COVID-19 and Long COVID can cause organ damage – involving the heart, lungs, kidneys, and brain; as well as inflammation, and studies suggest that severe COVID-19 is dominated by endothelial and immunological dysfunction, and immunothrombosis. Diagnostic tests for Long COVID are largely in development and finding effective therapies for Long COVID has been a major challenge; however, it is likely that antivirals have a role in preventing and treating Long COVID. Real-world data support the effectiveness of COVID-19 vaccines in reducing the risk of Long COVID. Long COVID remains a major challenge that needs considerable on-going research to determine effective treatments. The global public health emergency may be over but the fallout of Long COVID will be with us for some time.
Keywords: antiviral drugs, coronavirus, COVID-19, Long COVID, PASC, SARS-CoV-2.
Gary Grohmann BSc(Hons) PhD FASM (right) is a consultant virologist and a Director of Environmental Pathogens P/L, as well as a Board Member, and member of the Scientific Advisory Committee, of the Immunisation Coalition. He is an Adjunct Professor in Infectious Diseases and Immunology at The University of Sydney. He was Head of Immunobiology at the Therapeutic Goods Administration for 17 years and then a consultant to the World Health Organization on influenza and COVID‐19 matters for 7 years. |
Robert Booy MBBS, MSc, MD, FRACP, FRCPCH (left) is a Senior Professorial Fellow, Children’s Hospital at Westmead School of Child and Adolescent Health, University of Sydney. He has over 300 publications and has supervised 30 doctoral students. Robert has a long-term interest in the control and prevention of serious infectious diseases. He was a Board Member of the Immunisation Coalition for 12 years and still serves on its Scientific Advisory Committee as Chair. |
References
1 Australian Institute of Health and Welfare (2022) Long COVID in Australia – a review of the literature. Catalogue number PHE 318, 16 December 2022. AIHW. https://www.aihw.gov.au/reports/covid-19/long-covid-in-australia-a-review-of-the-literature/summary (accessed 22 February 2024)
2 Davis HE et al. (2023) Long COVID: major findings, mechanisms and recommendations. Nat Rev Microbiol 21, 133-146.
| Crossref | Google Scholar | PubMed |
3 World Health Organization Europe (2022) Post COVID-19 condition (Long COVID). 7 December 2022. WHO. https://www.who.int/europe/news-room/fact-sheets/item/post-covid-19-condition (accessed 22 February 2024)
4 Department of Health and Aged Care (2024) Sick and tired: casting a long shadow – Australian Government response to the inquiry into Long COVID. 15 February 2024. Commonwealth of Australia. https://www.health.gov.au/resources/publications/sick-and-tired-casting-a-long-shadow-australian-government-response-to-the-inquiry-into-long-covid?language=en (accessed 22 February 2024)
5 Department of Health and Aged Care (2024) Australian Centre for Disease Control. 1 January 2024. Commonwealth of Australia. https://www.health.gov.au/our-work/Australian-CDC (accessed 22 February 2024)
6 Mishra SS et al. (2023) Brain alterations in COVID recovered revealed by susceptibility-weighted magnetic resonance imaging. NeuroImage Clin [In press, preprint published 21 February 2023].
| Crossref | Google Scholar |
7 Orban ZS et al. (2023) SARS-CoV-2-specific immune responses in patients with postviral syndrome after suspected COVID-19. Neurol Neuroimmunol Neuroinflamm 10, e200159.
| Crossref | Google Scholar | PubMed |
8 Koc HC et al. (2022) Long COVID and its management. Int J Biol Sci 18, 4768-4780.
| Crossref | Google Scholar | PubMed |
9 Tong MZ et al. (2023) Elevated BMI reduces the humoral response to SARS‐CoV‐2 infection. Clin Transl Immunol 12, e1476.
| Crossref | Google Scholar | PubMed |
10 Castanares-Zapatero D et al. (2022) Pathophysiology and mechanism of Long COVID: a comprehensive review. Ann Med 54, 1473-1487.
| Crossref | Google Scholar | PubMed |
11 Bonaventura A et al. (2021) Endothelial dysfunction and immunothrombosis as key pathogenic mechanisms in COVID-19. Nat Rev Immunol 21, 319-329.
| Crossref | Google Scholar | PubMed |
12 Lewis W (2024) Viral protein fragments may unlock mystery behind serious COVID-19 outcomes. In UCLA Newsroom, 29 January 2024. University of California. https://newsroom.ucla.edu/releases/viral-protein-fragments-behind-serious-covid-19-outcomes
13 Tsilingiris D et al. (2023) Laboratory findings and biomarkers in Long COVID: what do we know so far? Insights into epidemiology, pathogenesis, therapeutic perspectives and challenges. Int J Mol Sci 24, 10458.
| Crossref | Google Scholar | PubMed |
14 Doctrow B (2023) Immune and hormonal features of Long COVID. In NIH Research Matters, 3 October 2023. National Institutes of Health. https://www.nih.gov/news-events/nih-research-matters/immune-hormonal-features-long-covid (accessed 2 March 2024)
15 Baillie K et al. (2024) Complement dysregulation is a predictive and therapeutically amenable feature of Long COVID. Med 5(3), 239-253.
| Crossref | Google Scholar |
16 Cohen AK et al. (2023) Impact of extended-course oral nirmatrelvir/ritonavir (Paxlovid) in established Long COVID: case series and research considerations. Res Sq [Preprint, published 19 September 2023].
| Crossref | Google Scholar | PubMed |
17 Geng LN et al. (2023) The use of nirmatrelvir–ritonavir in a case of breakthrough Long COVID. Explor Res Hypothesis Med 8(4), 394-396.
| Crossref | Google Scholar |
18 Xie Y et al. (2023) Molnupiravir and risk of post-acute sequelae of COVID-19: cohort study. BMJ 381, e074572.
| Crossref | Google Scholar |
19 Vogel AB et al. (2018) Self-amplifying RNA vaccines give equivalent protection against influenza to mRNA vaccines but at much lower doses. Mol Ther 26, 446-455.
| Crossref | Google Scholar | PubMed |
20 Sidik S (2024) Potent new pill provides COVID relief for the masses. Nature 625, 644.
| Crossref | Google Scholar | PubMed |
21 Cao B et al. (2024) Oral simnotrelvir for adult patients with mild-to-moderate COVID-19. N Engl J Med 390, 230-241.
| Crossref | Google Scholar | PubMed |
22 Rubin R (2022) From positive to negative to positive again—the mystery of why COVID-19 rebounds in some patients who take Paxlovid. JAMA 327, 2380-2382.
| Crossref | Google Scholar | PubMed |
23 Fung KW et al. (2023) Nirmatrelvir and Molnupiravir and post-COVID-19 condition in older patients. JAMA Intern Med 183, 1404-1406.
| Crossref | Google Scholar | PubMed |
24 Soucheray S (2023) Research shows small reduction in Long COVID with antiviral use. In CIDRAP News Brief, 25 October 2023. University of Minnesota. https://www.cidrap.umn.edu/covid-19/research-shows-small-reduction-long-covid-antiviral-use (accessed 22 February 2024)
25 Pitt B et al. (2022) Repurposing low-dose naltrexone for the prevention and treatment of immunothrombosis in COVID-19. Eur Heart J Cardiovasc Pharmacother 8, 402-405.
| Crossref | Google Scholar | PubMed |
26 Alper K (2020) Case report: famotidine for neuropsychiatric symptoms in COVID-19. Front Med 7, 614393.
| Crossref | Google Scholar | PubMed |
27 Cowan J et al. (2023) Monoclonal antibodies as COVID-19 prophylaxis therapy in immunocompromised patient populations. Int J Infect Dis 134, 228-238.
| Crossref | Google Scholar | PubMed |
28 Coscia F et al. (2023) Effect of physical activity on Long COVID fatigue: an unsolved enigma. Eur J Transl Myol 33, 11639.
| Crossref | Google Scholar |
29 Martin JH (2023) The valley of death: why Australia failed to develop clinically effective drugs in COVID‐19. Intern Med J 53, 2175-2179.
| Crossref | Google Scholar | PubMed |
30 Bhattacharya J et al. (2022) A practical treatment for COVID‐19 and the next pandemic. Pharmacol Res Perspect 10, e00988.
| Crossref | Google Scholar | PubMed |
31 Lam ICH et al. (2024) Persistence in risk and effect of COVID-19 vaccination on long-term health consequences after SARS-CoV-2 infection. Nat Commun 15, 1716.
| Crossref | Google Scholar | PubMed |
32 Department of Health and Aged Care (2024) National Post-Acute Sequelae of COVID-19 Plan. 15 February 2024. Australian Government. https://www.health.gov.au/resources/publications/national-post-acute-sequelae-of-covid-19-plan?language=en (accessed 2 March 2024)