Academic Journal
Dynamics of SARS-CoV-2 infection over two epidemic waves in Manaus, Brazil: A serological study of seven thousand blood donors.
| Title: | Dynamics of SARS-CoV-2 infection over two epidemic waves in Manaus, Brazil: A serological study of seven thousand blood donors. |
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| Authors: | Neal Alexander, Christopher Dye, Michael P Busch, Lewis Buss, Carlos A Prete, Oliver J Brady, Paul Mee, Claudia M M Abrahim, Myuki A E Crispim, Allyson G da Costa, Tassila Salomon, Philippe Mayaud, Márcio K Oikawa, Nuno R Faria, Ester C Sabino |
| Source: | PLoS ONE, Vol 20, Iss 1, p e0308319 (2025) |
| Publisher Information: | Public Library of Science (PLoS), 2025. |
| Publication Year: | 2025 |
| Collection: | LCC:Medicine LCC:Science |
| Subject Terms: | Medicine, Science |
| More Details: | BackgroundMost longitudinal studies of COVID-19 incidence have used unlinked samples. The city of Manaus, Brazil, has a blood donation program which allows sample linkage, and was struck by two large COVID-19 epidemic waves between mid-2020 and early 2021.MethodsWe estimated the changing force of infection, i.e. incidence in susceptible individuals. Seroconversion was inferred by a mixture model for serial values from the Abbott Architect SARS-CoV-2 nucleocapsid (N) IgG assay. We estimated the number of suspected COVID-19 hospitalizations arising from each infection over calendar time.ResultsWhole blood donations between April 2020 and March 2021 were included from 6734 people, 2747 with two or more donations. The inferred criterion for seroconversion, and thus an incident infection, was a 6.07 fold increase in N IgG reactivity. The overall force of infection was 1.19 per person year (95% confidence interval 1.14-1.24) during the two main waves. The estimated number of suspected hospitalizations per infection, was approximately 4.1 times higher in the second wave than in the first.ConclusionsSerial values from this assay can be used to infer seroconversion over time, and in Manaus show a higher number of suspected COVID-19 hospitalizations per infection in the second wave relative to the first. |
| Document Type: | article |
| File Description: | electronic resource |
| Language: | English |
| ISSN: | 1932-6203 |
| Relation: | https://doaj.org/toc/1932-6203 |
| DOI: | 10.1371/journal.pone.0308319 |
| Access URL: | https://doaj.org/article/9ebeec5b26bd45dabb7202eac8084c8d |
| Accession Number: | edsdoj.9ebeec5b26bd45dabb7202eac8084c8d |
| Database: | Directory of Open Access Journals |
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| ISSN: | 19326203 |
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| DOI: | 10.1371/journal.pone.0308319 |
| Published in: | PLoS ONE |
| Language: | English |