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Duration of infectiousness and correlation with RT-PCR cycle threshold values in cases of COVID-19, England, January to May 2020
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View Affiliations Hide AffiliationsMaria Zambonmaria.zambon phe.gov.uk
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Citation style for this article: . Duration of infectiousness and correlation with RT-PCR cycle threshold values in cases of COVID-19, England, January to May 2020. Euro Surveill. 2020;25(32):pii=2001483. https://doi.org/10.2807/1560-7917.ES.2020.25.32.2001483 Received: 03 Aug 2020; Accepted: 12 Aug 2020
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Abstract
Severe acute respiratory syndrome coronavirus 2 viral load in the upper respiratory tract peaks around symptom onset and infectious virus persists for 10 days in mild-to-moderate coronavirus disease (n = 324 samples analysed). RT-PCR cycle threshold (Ct) values correlate strongly with cultivable virus. Probability of culturing virus declines to 8% in samples with Ct > 35 and to 6% 10 days after onset; it is similar in asymptomatic and symptomatic persons. Asymptomatic persons represent a source of transmissible virus.
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This work is licensed under a Creative Commons Attribution 4.0 International License.
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