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Shimada N, Shinoda M, Takei H, Yoshida Y, Nishimura M, Kousaka M, Morikawa M, Sato T, Matsuse H, Shinkai M. A case of reinfection with a different variant of SARS-CoV-2: case report. THE EGYPTIAN JOURNAL OF INTERNAL MEDICINE 2023; 35:13. [PMID: 36785595 PMCID: PMC9907179 DOI: 10.1186/s43162-023-00194-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 01/24/2023] [Indexed: 02/11/2023] Open
Abstract
Background Coronavirus disease 2019 (COVID-19) was previously thought to have a low reinfection rate, but there are concerns that the reinfection rate will increase with the emergence and spread of mutant variants. This report describes the case of a 36-year-old, non-immunosuppressed man who was infected twice by two different variants of COVID-19 within a relatively short period. Case presentation A 36-year-old Japanese man with no comorbidities was infected with the E484K variant (R.1 lineage) of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Symptoms were mild and improved with symptomatic treatment alone. About four months later he presented to another outpatient department with high fever and headache. We diagnosed him as infected with the Alpha variant (B.1.1.7) of SARS-CoV-2 based on SARS-CoV-2 real-time reverse transcription polymerase chain reaction testing (RT-PCR). The patient was hospitalized with high fever. The patient received treatment in the form of anti-inflammatory therapy with corticosteroid and antibacterial chemotherapy. The patient improved without developing severe disease. Conclusion Concerns have been raised that the reinfection rate of COVID-19 will increase with the emergence of mutant variants. Particularly in mild cases, adequate amounts of neutralizing antibodies may not be produced, and reinfection may thus occur. Continued attention to sufficient infection control is thus essential.
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Affiliation(s)
- Nagashige Shimada
- Department of Respiratory Medicine, Tokyo Shinagawa Hospital, Tokyo, Japan ,grid.470115.6Division of Respiratory Medicine, Department of Internal Medicine, Toho University Ohashi Medical Center, Tokyo, Japan
| | - Masahiro Shinoda
- Department of Respiratory Medicine, Tokyo Shinagawa Hospital, Tokyo, Japan
| | - Hiroaki Takei
- Department of Respiratory Medicine, Tokyo Shinagawa Hospital, Tokyo, Japan ,grid.470115.6Division of Respiratory Medicine, Department of Internal Medicine, Toho University Ohashi Medical Center, Tokyo, Japan
| | - Yuto Yoshida
- Department of Respiratory Medicine, Tokyo Shinagawa Hospital, Tokyo, Japan ,grid.470115.6Division of Respiratory Medicine, Department of Internal Medicine, Toho University Ohashi Medical Center, Tokyo, Japan
| | - Masashi Nishimura
- Department of Respiratory Medicine, Tokyo Shinagawa Hospital, Tokyo, Japan
| | - Mio Kousaka
- Department of Respiratory Medicine, Tokyo Shinagawa Hospital, Tokyo, Japan
| | - Miwa Morikawa
- Department of Respiratory Medicine, Tokyo Shinagawa Hospital, Tokyo, Japan
| | - Takashi Sato
- Department of Respiratory Medicine, Tokyo Shinagawa Hospital, Tokyo, Japan
| | - Hiroto Matsuse
- grid.470115.6Division of Respiratory Medicine, Department of Internal Medicine, Toho University Ohashi Medical Center, Tokyo, Japan
| | - Masaharu Shinkai
- Department of Respiratory Medicine, Tokyo Shinagawa Hospital, Tokyo, Japan
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Host Cell Entry and Neutralization Sensitivity of SARS-CoV-2 Lineages B.1.620 and R.1. Viruses 2022; 14:v14112475. [PMID: 36366573 PMCID: PMC9698971 DOI: 10.3390/v14112475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 11/03/2022] [Accepted: 11/04/2022] [Indexed: 11/11/2022] Open
Abstract
The spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) facilitates viral entry into host cells and is the key target for neutralizing antibodies. The SARS-CoV-2 lineage B.1.620 carries fifteen mutations in the S protein and is spread in Africa, the US and Europe, while lineage R.1 harbors four mutations in S and infections were observed in several countries, particularly Japan and the US. However, the impact of the mutations in B.1.620 and R.1 S proteins on antibody-mediated neutralization and host cell entry are largely unknown. Here, we report that these mutations are compatible with robust ACE2 binding and entry into cell lines, and they markedly reduce neutralization by vaccine-induced antibodies. Our results reveal evasion of neutralizing antibodies by B.1.620 and R.1, which might have contributed to the spread of these lineages.
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Mathema B, Chen L, Wang P, Cunningham MH, Mediavilla JR, Chow KF, Luo Y, Zhao Y, Composto K, Zuckerman J, Zody MC, Wilson N, Lee A, Oschwald DM, Liu L, Iketani S, Germer S, Fennessey S, Wang M, Kramer Y, Toole P, Maniatis T, Ho DD, Perlin DS, Kreiswirth BN. Genomic Epidemiology and Serology Associated with a SARS-CoV-2 R.1 Variant Outbreak in New Jersey. mBio 2022; 13:e0214122. [PMID: 35997285 PMCID: PMC9600516 DOI: 10.1128/mbio.02141-22] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Accepted: 08/08/2022] [Indexed: 11/24/2022] Open
Abstract
Examining the neutralizing capacity of monoclonal antibodies (MAbs) used to treat COVID-19, as well as antibodies recovered from unvaccinated, previously vaccinated, and infected individuals, against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants of concern (VOCs) remains critical to study. Here, we report on a SARS-CoV-2 nosocomial outbreak caused by the SARS-CoV-2 R.1 variant harboring the E484K mutation in a 281-bed psychiatric facility in New Jersey among unvaccinated inpatients and health care professionals (HCPs). A total of 81 inpatients and HCPs tested positive for SARS-Cov-2 by reverse transcription (RT)-PCR from 29 October 9 to 30 November 2020. The R.1 variant exhibits partial or complete resistance to two MAbs in clinical use, as well as 2 receptor binding domain MAbs and 4 N-terminal domain (NTD) MAbs. NTD MAbs against pseudovirus harboring single characteristic R.1 mutations highlight the role of S255F in loss of activity. Additionally, we note dampened neutralization capacity by plasma from individuals with previous SARS-CoV-2 infection or sera from vaccinated individuals. The relative resistance of the R.1 variant is likely lower than that of B.1.351 and closer to that of P.1 and B.1.526. The R.1 lineage has been reported in 47 states in the United States and 40 countries. Although high proportions exhibited symptoms (26% and 61% among patients and HCPs, respectively) and relative antibody resistance, we detected only 10 R.1 variants from over 2,900 samples (~0.34%) collected from January to October 2021. Among 3 vaccinated individuals previously infected with R.1, we observed robust neutralizing antibody responses against SARS-CoV-2 wild type and VOCs. IMPORTANCE The neutralizing capacities of monoclonal antibodies used to treat COVID-19 and of those recovered from previously infected and vaccinated individuals against SARS-CoV-2 variants of concern (VOCs) remain important questions. We report on a nosocomial outbreak caused by a SARS-CoV-2 R.1 variant harboring an E484K mutation among 81 unvaccinated inpatients and health care professionals. We note high attack rates with symptoms in nearly 50% of infected individuals, in sharp contrast to an unrelated institutional outbreak caused by the R.1 variant among a vaccinated population. We found little evidence of significant community spillover. This variant exhibits partial or complete resistance to two monoclonal antibodies in clinical use and dampened the neutralization capacity of convalescent-phase plasma from individuals with previous infection or sera from vaccinated individuals. Among three vaccinated individuals previously infected with R.1, we observed robust neutralizing antibody responses against SARS-CoV-2 wild type and VOCs. These findings underscore the importance of vaccination for prevention of symptomatic COVID-19 disease.
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Affiliation(s)
- Barun Mathema
- Department of Epidemiology, Mailman School of Public Health, Columbia University Irving Medical Center, New York, New York, USA
| | - Liang Chen
- Hackensack Meridian Health Center for Discovery and Innovation, Nutley, New Jersey, USA
- Hackensack Meridian School of Medicine, Nutley, New Jersey, USA
| | - Pengfei Wang
- Aaron Diamond AIDS Research Center, Columbia University Vagelos College of Physicians and Surgeons, New York, New York, USA
| | - Marcus H. Cunningham
- Hackensack Meridian Health Center for Discovery and Innovation, Nutley, New Jersey, USA
| | - Jose R. Mediavilla
- Hackensack Meridian Health Center for Discovery and Innovation, Nutley, New Jersey, USA
| | - Kar Fai Chow
- Hackensack Meridian Health Biorepository, Hackensack, New Jersey, USA
| | - Yang Luo
- Aaron Diamond AIDS Research Center, Columbia University Vagelos College of Physicians and Surgeons, New York, New York, USA
| | - Yanan Zhao
- Hackensack Meridian Health Center for Discovery and Innovation, Nutley, New Jersey, USA
- Hackensack Meridian School of Medicine, Nutley, New Jersey, USA
| | - Kaelea Composto
- Hackensack Meridian Health Center for Discovery and Innovation, Nutley, New Jersey, USA
| | - Jerry Zuckerman
- Hackensack University Medical Center, Hackensack, New Jersey, USA
| | | | - Nancy Wilson
- Hackensack Meridian Health, Carrier Clinic, Belle Mead, New Jersey, USA
| | - Annie Lee
- Hackensack Meridian Health Center for Discovery and Innovation, Nutley, New Jersey, USA
| | | | - Lihong Liu
- Aaron Diamond AIDS Research Center, Columbia University Vagelos College of Physicians and Surgeons, New York, New York, USA
| | - Sho Iketani
- Department of Microbiology and Immunology, Columbia University Irving Medical Center, New York, New York, USA
| | | | | | - Maple Wang
- Aaron Diamond AIDS Research Center, Columbia University Vagelos College of Physicians and Surgeons, New York, New York, USA
| | - Yael Kramer
- Hackensack Meridian Health Biorepository, Hackensack, New Jersey, USA
| | - Patricia Toole
- Hackensack Meridian Health, Carrier Clinic, Belle Mead, New Jersey, USA
| | | | - David D. Ho
- Aaron Diamond AIDS Research Center, Columbia University Vagelos College of Physicians and Surgeons, New York, New York, USA
- Department of Microbiology and Immunology, Columbia University Irving Medical Center, New York, New York, USA
- Division of Infectious Diseases, Department of Medicine, Columbia University Vagelos College of Physicians and Surgeons, New York, New York, USA
| | - David S. Perlin
- Hackensack Meridian Health Center for Discovery and Innovation, Nutley, New Jersey, USA
- Hackensack Meridian School of Medicine, Nutley, New Jersey, USA
| | - Barry N. Kreiswirth
- Hackensack Meridian Health Center for Discovery and Innovation, Nutley, New Jersey, USA
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4
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Matsumura Y, Nagao M, Yamamoto M, Tsuchido Y, Noguchi T, Shinohara K, Yukawa S, Inoue H, Ikeda T. Transmissibility of SARS-CoV-2 B.1.1.214 and Alpha Variants during 4 COVID-19 Waves, Kyoto, Japan, January 2020-June 2021. Emerg Infect Dis 2022; 28. [PMID: 35710464 PMCID: PMC9328921 DOI: 10.3201/eid2808.220420] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Household transmission is a primary source of SARS-CoV-2 spread. We used COVID-19 epidemiologic investigation data and viral genome analysis data collected in the city of Kyoto, Japan, during January 2020–June 2021 to evaluate the effects of different settings and viral strains on SARS-CoV-2 transmission. Epidemiologic investigations of 5,061 COVID-19 cases found that the most common category for close contact was within households (35.3%); this category also had the highest reverse transcription PCR positivity. The prevalent viral lineage shifted from B.1.1.214 in the third wave to the Alpha variant in the fourth wave. The proportion of secondary cases associated with households also increased from the third to fourth waves (27% vs. 29%). Among 564 contacts from 206 households, Alpha variant was significantly associated with household transmission (odds ratio 1.52, 95% CI 1.06–2.18) compared with B.1.1.214. Public health interventions targeting household contacts and specific variants could help control SARS-CoV-2 transmission.
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5
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Zhou H, Ni WJ, Huang W, Wang Z, Cai M, Sun YC. Advances in Pathogenesis, Progression, Potential Targets and Targeted Therapeutic Strategies in SARS-CoV-2-Induced COVID-19. Front Immunol 2022; 13:834942. [PMID: 35450063 PMCID: PMC9016159 DOI: 10.3389/fimmu.2022.834942] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Accepted: 03/07/2022] [Indexed: 01/18/2023] Open
Abstract
As the new year of 2020 approaches, an acute respiratory disease quietly caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), also known as coronavirus disease 2019 (COVID-19) was reported in Wuhan, China. Subsequently, COVID-19 broke out on a global scale and formed a global public health emergency. To date, the destruction that has lasted for more than two years has not stopped and has caused the virus to continuously evolve new mutant strains. SARS-CoV-2 infection has been shown to cause multiple complications and lead to severe disability and death, which has dealt a heavy blow to global development, not only in the medical field but also in social security, economic development, global cooperation and communication. To date, studies on the epidemiology, pathogenic mechanism and pathological characteristics of SARS-CoV-2-induced COVID-19, as well as target confirmation, drug screening, and clinical intervention have achieved remarkable effects. With the continuous efforts of the WHO, governments of various countries, and scientific research and medical personnel, the public's awareness of COVID-19 is gradually deepening, a variety of prevention methods and detection methods have been implemented, and multiple vaccines and drugs have been developed and urgently marketed. However, these do not appear to have completely stopped the pandemic and ravages of this virus. Meanwhile, research on SARS-CoV-2-induced COVID-19 has also seen some twists and controversies, such as potential drugs and the role of vaccines. In view of the fact that research on SARS-CoV-2 and COVID-19 has been extensive and in depth, this review will systematically update the current understanding of the epidemiology, transmission mechanism, pathological features, potential targets, promising drugs and ongoing clinical trials, which will provide important references and new directions for SARS-CoV-2 and COVID-19 research.
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Affiliation(s)
- Hong Zhou
- Department of Pharmacy, Anhui Provincial Cancer Hospital, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Wei-Jian Ni
- Inflammation and Immune Mediated Diseases Laboratory of Anhui Province, The Key Laboratory of Anti-inflammatory of Immune Medicines, Ministry of Education, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, China
- Anhui Provincial Hospital, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Wei Huang
- The Third People’s Hospital of Hefei, The Third Clinical College of Anhui Medical University, Hefei, China
| | - Zhen Wang
- Anhui Provincial Children’s Hospital, Children’s Hospital of Fudan University-Anhui Campus, Hefei, China
| | - Ming Cai
- Department of Pharmacy, The Second Affiliated Hospital of Anhui University of Chinese Medicine, Hefei, China
- School of Pharmacy, Anhui University of Chinese Medicine, Hefei, China
| | - Yan-Cai Sun
- Department of Pharmacy, Anhui Provincial Cancer Hospital, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
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6
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Inada M, Ishikane M, Terada M, Matsunaga A, Maeda K, Iwamoto N, Ujiie M, Kutsuna S, Morioka S, Ishizaka Y, Mitsuya H, Ohmagari N. Antibody responses after two doses of SARS-CoV-2 mRNA-1273 vaccine in an individual with history of COVID-19 re-infection. Int J Infect Dis 2022; 119:18-20. [PMID: 35306204 PMCID: PMC8925083 DOI: 10.1016/j.ijid.2022.03.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 03/10/2022] [Accepted: 03/12/2022] [Indexed: 11/29/2022] Open
Abstract
We present a case of a 58-year-old Japanese man with a history of 2 previous COVID-19 infections, who received 2 doses of mRNA-1273 vaccine. We are not aware of any previous study regarding antibody tendency after 2 infections and 2 vaccinations. We evaluated his IgG titer of antispike protein and neutralizing activity from the first infection before and after 2 doses of vaccine. Both antispike IgG titer and neutralizing activity showed a tendency to decline almost 1 year after initial infection; they rapidly increased after the first vaccination, and they remained high after the second vaccination. Although this is a single case report, it seems to have generalizability because the findings are consistent with previous reports regarding single infections or 3 doses of vaccination. Our findings suggest that a single booster shot may provide sufficient protection and aid the understanding of immunologic responses of vaccination in patients with COVID-19 with history of re-infection.
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Affiliation(s)
- Makoto Inada
- Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Masahiro Ishikane
- Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan.
| | - Mari Terada
- Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan; Center for Clinical Science, National Center for Global Health and Medicine, Tokyo, Japan
| | - Akihiro Matsunaga
- Department of Intractable Diseases, Research Institute, National Center for Global Health and Medicine, Tokyo, Japan
| | - Kenji Maeda
- Department of Refractory Viral Infections, Research Institute, National Center for Global Health and Medicine, Tokyo, Japan
| | - Noriko Iwamoto
- Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Mugen Ujiie
- Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Satoshi Kutsuna
- Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan; Professor, Department of Infection Control, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Shinichiro Morioka
- Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Yukihito Ishizaka
- Department of Intractable Diseases, Research Institute, National Center for Global Health and Medicine, Tokyo, Japan; Vice Director General, Research Institute, National Center for Global Health and Medicine, Tokyo, Japan
| | - Hiroaki Mitsuya
- Department of Refractory Viral Infections, Research Institute, National Center for Global Health and Medicine, Tokyo, Japan; Director General, Research Institute, National Center for Global Health and Medicine, Tokyo, Japan
| | - Norio Ohmagari
- Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan
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7
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Chakraborty C, Sharma AR, Bhattacharya M, Lee SS. A Detailed Overview of Immune Escape, Antibody Escape, Partial Vaccine Escape of SARS-CoV-2 and Their Emerging Variants With Escape Mutations. Front Immunol 2022; 13:801522. [PMID: 35222380 PMCID: PMC8863680 DOI: 10.3389/fimmu.2022.801522] [Citation(s) in RCA: 73] [Impact Index Per Article: 36.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 01/05/2022] [Indexed: 01/08/2023] Open
Abstract
The infective SARS-CoV-2 is more prone to immune escape. Presently, the significant variants of SARS-CoV-2 are emerging in due course of time with substantial mutations, having the immune escape property. Simultaneously, the vaccination drive against this virus is in progress worldwide. However, vaccine evasion has been noted by some of the newly emerging variants. Our review provides an overview of the emerging variants' immune escape and vaccine escape ability. We have illustrated a broad view related to viral evolution, variants, and immune escape ability. Subsequently, different immune escape approaches of SARS-CoV-2 have been discussed. Different innate immune escape strategies adopted by the SARS-CoV-2 has been discussed like, IFN-I production dysregulation, cytokines related immune escape, immune escape associated with dendritic cell function and macrophages, natural killer cells and neutrophils related immune escape, PRRs associated immune evasion, and NLRP3 inflammasome associated immune evasion. Simultaneously we have discussed the significant mutations related to emerging variants and immune escape, such as mutations in the RBD region (N439K, L452R, E484K, N501Y, K444R) and other parts (D614G, P681R) of the S-glycoprotein. Mutations in other locations such as NSP1, NSP3, NSP6, ORF3, and ORF8 have also been discussed. Finally, we have illustrated the emerging variants' partial vaccine (BioNTech/Pfizer mRNA/Oxford-AstraZeneca/BBIBP-CorV/ZF2001/Moderna mRNA/Johnson & Johnson vaccine) escape ability. This review will help gain in-depth knowledge related to immune escape, antibody escape, and partial vaccine escape ability of the virus and assist in controlling the current pandemic and prepare for the next.
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Affiliation(s)
- Chiranjib Chakraborty
- Department of Biotechnology, School of Life Science and Biotechnology, Adamas University, Kolkata, India
| | - Ashish Ranjan Sharma
- Institute for Skeletal Aging and Orthopedic Surgery, Hallym University-Chuncheon Sacred Heart Hospital, Chuncheon-si, South Korea
| | | | - Sang-Soo Lee
- Institute for Skeletal Aging and Orthopedic Surgery, Hallym University-Chuncheon Sacred Heart Hospital, Chuncheon-si, South Korea
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8
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Hirotsu Y, Omata M. SARS-CoV-2 B.1.1.7 lineage rapidly spreads and replaces R.1 lineage in Japan: Serial and stationary observation in a community. INFECTION GENETICS AND EVOLUTION 2021; 95:105088. [PMID: 34560289 PMCID: PMC8454025 DOI: 10.1016/j.meegid.2021.105088] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Revised: 09/09/2021] [Accepted: 09/17/2021] [Indexed: 11/18/2022]
Abstract
Background The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) circulates in the world and acquires mutations during evolution. To identify the new emergent variants, the surveillance of the variants of concern (VOC) and variants of interest (VOI) is ongoing. This study aimed to determine how the transition of viral lineage occurred by stationary genome analysis in Yamanashi, Japan. Methods We performed the whole genome sequencing using SARS-CoV-2 positive samples collected from February 2020 to the end of June 2021. Viral lineage was defined by the Phylogenetic Assignment of Named Global Outbreak (PANGO) lineages. Results We successfully obtained 325 viral genome sequences and the number of analyzed samples accounted for 15.4% of the total 2109 COVID-19 patients identified in our district. We identified 13 types of viral lineages including R.1, P.1, B.1.1.7 (Alpha) and B.1.617.2 (Delta). These virus lineages had distinct periods of expansion and decline. After the emerging of the R.1 lineage harboring E484K variant (designated VOI in Japan), the prevalent B.1.1.214 lineage were no longer identified. The R.1 lineages were temporarily prevalent afterwards, but the influx of B.1.1.7 lineage (designated VOC) led to a decline in R.1. Currently, B.1.1.7 has become dominant after mid-April 2021. Conclusion We clearly elucidated the transition and replacement of viral lineage by the community-based analysis. The virus completely replaced by more infectious lineages, therefore, it will be necessary to continue to monitor the VOC and VOI.
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Affiliation(s)
- Yosuke Hirotsu
- Genome Analysis Center, Yamanashi Central Hospital, 1-1-1 Fujimi, Kofu, Yamanashi, Japan.
| | - Masao Omata
- Department of Gastroenterology, Yamanashi Central Hospital, 1-1-1 Fujimi, Kofu, Yamanashi, Japan; The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan
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