Coronavirus Disease 2019 (COVID-19) Re-infection by a Phylogenetically Distinct Severe Acute Respiratory Syndrome Coronavirus 2 Strain Confirmed by Whole Genome Sequencing
Open accessAbstract
Background: Waning immunity occurs in patients who have recovered from Coronavirus Disease 2019 (COVID-19). However, it remains unclear whether true re-infection occurs. Methods: Whole genome sequencing was performed directly on respiratory specimens collected during 2 episodes of COVID-19 in a patient. Comparative genome analysis was conducted to differentiate re-infection from persistent viral shedding. Laboratory results, including RT-PCR Ct values and serum Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) IgG, were analyzed. Results: The second episode of asymptomatic infection occurred 142 days after the first symptomatic episode in an apparently immunocompetent patient. During the second episode, there was evidence of acute infection including elevated C-reactive protein and SARS-CoV-2 IgG seroconversion. Viral genomes from first and second episodes belong to different clades/lineages. The virus genome from the first episode contained a a stop codon at position 64 of ORF8, leading to a truncation of 58 amino acids. Another 23 nucleotide and 13 amino acid differences located in 9 different proteins, including positions of B and T cell epitopes, were found between viruses from the first and second episodes. Compared to viral genomes in GISAID, the first virus genome was phylogenetically closely related to strains collected in March/April 2020, while the second virus genome was closely related to strains collected in July/August 2020. Conclusions: Epidemiological, clinical, serological, and genomic analyses confirmed that the patient had re-infection instead of persistent viral shedding from first infection. Our results suggest SARS-CoV-2 may continue to circulate among humans despite herd immunity due to natural infection. Further studies of patients with re-infection will shed light on protective immunological correlates for guiding vaccine design.
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Reinfections with clearly different SARS-CoV-2 strains have been documented.
“Nonetheless, reinfections with clearly different SARS-CoV-2 strains have now been documented50,51 (Supplementary Table 2).”
From Prospects for durable immune control of SARS-CoV-2 and prevention of reinfection (2021) · cites this paper as [51]
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- Authors
- To, K. K.-W., Hung, I. F.-N., Ip, J. D., Chu, A. W.-H., Chan, W.-M., Tam, A. R., Fong, C. H.-Y., Yuan, S., Tsoi, H.-W., Ng, A. C.-K., Lee, L. L.-Y., Wan, P., Tso, E. Y.-K., To, W.-K., Tsang, D. N.-C., Chan, K.-H., Huang, J.-D., Kok, K.-H., Cheng, V. C.-C., & Yuen, K.-Y.
- Affiliations
- Queen Mary Hospital (CN)
- University of Hong Kong (HK)
- Department of Accident and Emergency Medicine, Tin Shui Wai Hospital, Hong Kong Special Administrative Region, China
- Department of Accident and Emergency, North Lantau Hospital, Hong Kong Special Administrative Region, China
- United Christian Hospital (CN)
- Princess Margaret Hospital (HK)
- Department of Health (CN)
- Corresponding author
- Yuen, Kwok-Yung
- ORCID
- Venue
- Clinical Infectious Diseases
- Publisher
- Oxford University Press (OUP)
- Published
- 2020-08-25
- Volume
- 73
- Issue
- 9
- Pages
- e2946-e2951
- ISSN
- 1058-4838 (ISSN-L)
- 1537-6591
- PMC
- PMC7499500
- OpenAlex
- W3080458234
- Cited by
- 746
- References
- 35
- Citations by year
- 2026: 1 · 2025: 6 · 2024: 35 · 2023: 50 · 2022: 133 · 2021: 364 · 2020: 156 · 2014: 1
- FWCI
- 23.13
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model (vor)
- Locations
- Clinical Infectious Diseases (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Consultancy Service
- HKSAR
- Theme-Based Research Scheme (T11/707/15)
- Research Grants Council
- Shaw Foundation Hong Kong
- Respiratory Viral Research Foundation Limited
- Charity Fund Limited
- Memorial Charitable Foundation
- Topics
- Health Sciences › Medicine › Infectious Diseases › SARS-CoV-2 and COVID-19 Research
- Health Sciences › Medicine › Infectious Diseases › COVID-19 Clinical Research Studies
- Health Sciences › Medicine › Infectious Diseases › SARS-CoV-2 detection and testing
- Keywords
- COVID-19 pandemic, SARS-CoV-2 reinfection, waning immunity, prolonged viral shedding, viral epitopes, herd immunity, vaccine design
- MeSH terms
- Whole Genome Sequencing, Reinfection, COVID-19, SARS-CoV-2, Antibodies, Viral, Humans, Genome, Viral
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