{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,27]],"date-time":"2025-11-27T16:39:53Z","timestamp":1764261593328,"version":"3.46.0"},"reference-count":46,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2025,11,27]],"date-time":"2025-11-27T00:00:00Z","timestamp":1764201600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Carlos Chagas Filho Foundation for Research Support of the State of Rio de Janeiro"},{"name":"Young Scientist of Our State\u20142023","award":["E-26\/210.867\/2024"],"award-info":[{"award-number":["E-26\/210.867\/2024"]}]},{"name":"Basic Research Support Program","award":["E-26\/204.529\/2024"],"award-info":[{"award-number":["E-26\/204.529\/2024"]}]},{"DOI":"10.13039\/501100003593","name":"National Council for Scientific and Technological Development","doi-asserted-by":"publisher","award":["403535\/2023-9"],"award-info":[{"award-number":["403535\/2023-9"]}],"id":[{"id":"10.13039\/501100003593","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Viruses"],"abstract":"<jats:p>Face masks are widely recognized as a key intervention to limit SARS-CoV-2 transmission, yet the distribution and persistence of viral RNA across different mask regions and layers remain poorly understood. To address this, we analyzed 185 masks collected from 60 SARS-CoV-2-positive individuals in Rio de Janeiro between December 2020 and September 2022. Masks were sectioned into anatomical regions (nose, mouth, sides) and structural layers (inner, middle, outer), and viral RNA was quantified using RT-qPCR. Samples with the highest viral loads were selected for partial sequencing of the spike gene, and paired analyses with swab samples were performed. Statistical comparisons included non-parametric tests and a linear mixed-effects model. Our results showed that the inner layer and nose region consistently harbored the highest viral RNA levels, with no significant differences between surgical and fabric masks. Viral load decreased by an estimated 39% per day, consistent with exponential decay. Sequencing confirmed identical viral genomes in masks and swabs and allowed identification of circulating variants, including Gamma and Omicron. These findings indicate that masks serve not only as effective physical barriers but also as non-invasive sources for genomic surveillance, providing insights into viral shedding patterns and informing strategies for monitoring and controlling SARS-CoV-2 transmission.<\/jats:p>","DOI":"10.3390\/v17121552","type":"journal-article","created":{"date-parts":[[2025,11,27]],"date-time":"2025-11-27T16:31:52Z","timestamp":1764261112000},"page":"1552","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Comparative Assessment of Viral Load Retention in Surgical and Fabric Masks Worn by COVID-19 Patients"],"prefix":"10.3390","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-4017-0775","authenticated-orcid":false,"given":"Cristiane Monteiro","family":"Eller","sequence":"first","affiliation":[{"name":"Biosafety Level 3 Facility (BSL-3), Instituto Oswaldo Cruz, Oswaldo Cruz Foundation, Rio de Janeiro 21040-900, Brazil"},{"name":"Laboratory of Hantavirus and Rickettsias, Instituto Oswaldo Cruz, Oswaldo Cruz Foundation, Rio de Janeiro 21040-900, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Milena De Paula","family":"Rebello","sequence":"additional","affiliation":[{"name":"Laboratory of Virology and Molecular Parasitology, Instituto Oswaldo Cruz, Oswaldo Cruz Foundation, Rio de Janeiro 21040-900, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9256-2582","authenticated-orcid":false,"given":"Andreza","family":"S\u00e1lvio","sequence":"additional","affiliation":[{"name":"Laboratory of Translational Neurosciences, Biomedical Institute, Federal University of the State of Rio de Janeiro, Rio de Janeiro 20211-040, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Emanuelle S. R. F.","family":"Silva","sequence":"additional","affiliation":[{"name":"COVID-19 Analytical Center, Instituto Oswaldo Cruz, Oswaldo Cruz, Rio de Janeiro 21040-900, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0183-1175","authenticated-orcid":false,"given":"Vin\u00edcius Silva","family":"Belo","sequence":"additional","affiliation":[{"name":"Centro-Oeste Dona Lindu Campus, Federal University of S\u00e3o Jo\u00e3o del-Rei\u2014UFSJ, Divin\u00f3polis 35501-296, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Elba Regina E.","family":"Lemos","sequence":"additional","affiliation":[{"name":"Laboratory of Hantavirus and Rickettsias, Instituto Oswaldo Cruz, Oswaldo Cruz Foundation, Rio de Janeiro 21040-900, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5849-7326","authenticated-orcid":false,"given":"Marta","family":"Giovanetti","sequence":"additional","affiliation":[{"name":"Department of Sciences and Technologies for Sustainable Development and One Health, Universita Campus Bio-Medico di Roma, 00128 Rome, Italy"},{"name":"Laboratory of Flaviviruses, Instituto Oswaldo Cruz, Oswaldo Cruz Foundation (Fiocruz), Rio de Janeiro 21040-900, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4288-8680","authenticated-orcid":false,"given":"Jos\u00e9 J\u00fanior Fran\u00e7a","family":"De Barros","sequence":"additional","affiliation":[{"name":"Laboratory of Virology and Molecular Parasitology, Instituto Oswaldo Cruz, Oswaldo Cruz Foundation, Rio de Janeiro 21040-900, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4117-5379","authenticated-orcid":false,"given":"Marco Aur\u00e9lio","family":"Horta","sequence":"additional","affiliation":[{"name":"Biosafety Level 3 Facility (BSL-3), Instituto Oswaldo Cruz, Oswaldo Cruz Foundation, Rio de Janeiro 21040-900, Brazil"},{"name":"Laboratory of Hantavirus and Rickettsias, Instituto Oswaldo Cruz, Oswaldo Cruz Foundation, Rio de Janeiro 21040-900, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,11,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"861","DOI":"10.1093\/cid\/ciaa316","article-title":"COVID-19 Transmission Within a Family Cluster by Presymptomatic Carriers in China","volume":"71","author":"Qian","year":"2020","journal-title":"Clin. 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