Viral burden is associated with age, vaccination, and viral variant in a population-representative study of SARS-CoV-2 that accounts for time-since-infection-related sampling bias
In this study, we evaluated the impact of viral variant, in addition to other variables, on within-host viral burden, by analysing cycle threshold (Ct) values derived from nose and throat swabs, collected as part of the UK COVID-19 Infection Survey. Because viral burden distributions determined from...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
Public Library of Science
2023
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| _version_ | 1797111538177277952 |
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| author | Fryer, HR Golubchik, T Hall, M Fraser, C Hinch, R Ferretti, L Thomson, L Nurtay, A Pellis, L House, T MacIntyre-Cockett, G Trebes, A Buck, D Piazza, P Green, A Lonie, LJ Smith, D Bashton, M Crown, M Nelson, A McCann, CM Adnan Tariq, M Elstob, CJ Nunes Dos Santos, R Richards, Z Xhang, X Hawley, J Lee, MR Carrillo-Barragan, P Chapman, I Harthern-Flint, S Bonsall, D Lythgoe, KA |
| author2 | COVID-19 Genomics UK (COG-UK) consortium |
| author_facet | COVID-19 Genomics UK (COG-UK) consortium Fryer, HR Golubchik, T Hall, M Fraser, C Hinch, R Ferretti, L Thomson, L Nurtay, A Pellis, L House, T MacIntyre-Cockett, G Trebes, A Buck, D Piazza, P Green, A Lonie, LJ Smith, D Bashton, M Crown, M Nelson, A McCann, CM Adnan Tariq, M Elstob, CJ Nunes Dos Santos, R Richards, Z Xhang, X Hawley, J Lee, MR Carrillo-Barragan, P Chapman, I Harthern-Flint, S Bonsall, D Lythgoe, KA |
| author_sort | Fryer, HR |
| collection | OXFORD |
| description | In this study, we evaluated the impact of viral variant, in addition to other variables, on within-host viral burden, by analysing cycle threshold (Ct) values derived from nose and throat swabs, collected as part of the UK COVID-19 Infection Survey. Because viral burden distributions determined from community survey data can be biased due to the impact of variant epidemiology on the time-since-infection of samples, we developed a method to explicitly adjust observed Ct value distributions to account for the expected bias. By analysing the adjusted Ct values using partial least squares regression, we found that among unvaccinated individuals with no known prior exposure, viral burden was 44% lower among Alpha variant infections, compared to those with the predecessor strain, B.1.177. Vaccination reduced viral burden by 67%, and among vaccinated individuals, viral burden was 286% higher among Delta variant, compared to Alpha variant, infections. In addition, viral burden increased by 17% for every 10-year age increment of the infected individual. In summary, within-host viral burden increases with age, is reduced by vaccination, and is influenced by the interplay of vaccination status and viral variant. |
| first_indexed | 2024-03-07T08:10:14Z |
| format | Journal article |
| id | oxford-uuid:d9523814-c1e3-488d-9129-7fbf683080c3 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T08:10:14Z |
| publishDate | 2023 |
| publisher | Public Library of Science |
| record_format | dspace |
| spelling | oxford-uuid:d9523814-c1e3-488d-9129-7fbf683080c32023-11-21T16:00:31ZViral burden is associated with age, vaccination, and viral variant in a population-representative study of SARS-CoV-2 that accounts for time-since-infection-related sampling biasJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:d9523814-c1e3-488d-9129-7fbf683080c3EnglishSymplectic ElementsPublic Library of Science2023Fryer, HRGolubchik, THall, MFraser, CHinch, RFerretti, LThomson, LNurtay, APellis, LHouse, TMacIntyre-Cockett, GTrebes, ABuck, DPiazza, PGreen, ALonie, LJSmith, DBashton, MCrown, MNelson, AMcCann, CMAdnan Tariq, MElstob, CJNunes Dos Santos, RRichards, ZXhang, XHawley, JLee, MRCarrillo-Barragan, PChapman, IHarthern-Flint, SBonsall, DLythgoe, KACOVID-19 Genomics UK (COG-UK) consortiumIn this study, we evaluated the impact of viral variant, in addition to other variables, on within-host viral burden, by analysing cycle threshold (Ct) values derived from nose and throat swabs, collected as part of the UK COVID-19 Infection Survey. Because viral burden distributions determined from community survey data can be biased due to the impact of variant epidemiology on the time-since-infection of samples, we developed a method to explicitly adjust observed Ct value distributions to account for the expected bias. By analysing the adjusted Ct values using partial least squares regression, we found that among unvaccinated individuals with no known prior exposure, viral burden was 44% lower among Alpha variant infections, compared to those with the predecessor strain, B.1.177. Vaccination reduced viral burden by 67%, and among vaccinated individuals, viral burden was 286% higher among Delta variant, compared to Alpha variant, infections. In addition, viral burden increased by 17% for every 10-year age increment of the infected individual. In summary, within-host viral burden increases with age, is reduced by vaccination, and is influenced by the interplay of vaccination status and viral variant. |
| spellingShingle | Fryer, HR Golubchik, T Hall, M Fraser, C Hinch, R Ferretti, L Thomson, L Nurtay, A Pellis, L House, T MacIntyre-Cockett, G Trebes, A Buck, D Piazza, P Green, A Lonie, LJ Smith, D Bashton, M Crown, M Nelson, A McCann, CM Adnan Tariq, M Elstob, CJ Nunes Dos Santos, R Richards, Z Xhang, X Hawley, J Lee, MR Carrillo-Barragan, P Chapman, I Harthern-Flint, S Bonsall, D Lythgoe, KA Viral burden is associated with age, vaccination, and viral variant in a population-representative study of SARS-CoV-2 that accounts for time-since-infection-related sampling bias |
| title | Viral burden is associated with age, vaccination, and viral variant in a population-representative study of SARS-CoV-2 that accounts for time-since-infection-related sampling bias |
| title_full | Viral burden is associated with age, vaccination, and viral variant in a population-representative study of SARS-CoV-2 that accounts for time-since-infection-related sampling bias |
| title_fullStr | Viral burden is associated with age, vaccination, and viral variant in a population-representative study of SARS-CoV-2 that accounts for time-since-infection-related sampling bias |
| title_full_unstemmed | Viral burden is associated with age, vaccination, and viral variant in a population-representative study of SARS-CoV-2 that accounts for time-since-infection-related sampling bias |
| title_short | Viral burden is associated with age, vaccination, and viral variant in a population-representative study of SARS-CoV-2 that accounts for time-since-infection-related sampling bias |
| title_sort | viral burden is associated with age vaccination and viral variant in a population representative study of sars cov 2 that accounts for time since infection related sampling bias |
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