Temporal profile of SARS-CoV-2 viral load in posterior nasopharyngeal samples: Analysis of 944 patients in Apulia, Italy
Objectives: The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic has heavily impacted Italy. The government's restriction measures have attenuated the burden on hospitals. The association of high viral replication with disease severity suggests the potential for lower viral...
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doaj-a493129851824310a11a936204abf58d2021-03-27T04:26:12ZengElsevierInternational Journal of Infectious Diseases1201-97122021-03-01104696700Temporal profile of SARS-CoV-2 viral load in posterior nasopharyngeal samples: Analysis of 944 patients in Apulia, ItalyMoris Sangineto0Fabio Arena1Rosella De Nittis2Rosanna Villani3Crescenzio Gallo4Gaetano Serviddio5C.U.R.E. (University Center for Liver Disease Research and Treatment), Liver Unit, Department of Medical and Surgical Sciences, University of Foggia, Foggia, ItalyDepartment of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy; IRCCS Don Carlo Gnocchi Foundation, Florence, ItalyMicrobiology Unit, Ospedali Riuniti University Hospital, Foggia, ItalyC.U.R.E. (University Center for Liver Disease Research and Treatment), Liver Unit, Department of Medical and Surgical Sciences, University of Foggia, Foggia, ItalyDepartment of Clinical and Experimental Medicine, University of Foggia, Foggia, ItalyC.U.R.E. (University Center for Liver Disease Research and Treatment), Liver Unit, Department of Medical and Surgical Sciences, University of Foggia, Foggia, Italy; Corresponding author at: C.U.R.E. (University Center for Liver Disease Research and Treatment), Liver Unit, Department of Medical and Surgical Sciences, University of Foggia, Viale Pinto 1, 71122 Foggia, Italy.Objectives: The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic has heavily impacted Italy. The government's restriction measures have attenuated the burden on hospitals. The association of high viral replication with disease severity suggests the potential for lower viral load in milder clinical presentations. Methods: The reverse-transcription-polymerase-chain-reaction (RT-PCR) profile of 944 consecutive, non-replicate, positive retropharyngeal swabs was collected from 3 March to 8 June 2020 to investigate the temporal profile of SARS-CoV-2 viral load in the region of Capitanata, Apulia. Cycle threshold (Ct) values of 3 targets (N [nucleocapsid protein], E [envelope protein] and RdRP [RNA-dependent RNA-polymerase]) were analysed. Results: The median Ct values of the 3 targets increased considerably over the study period, showing a progressive and constant weekly change. The negative detection rate of E and RdRP increased over time. These data suggest that SARS-CoV-2 viral load progressively decreased along the outbreak course. During the first epidemic peak (March and April) the viral load among patients >80-years was significantly higher than for younger subjects. However, in May this age-dependent difference disappeared, underlying viral load reduction in the elderly. Conclusions: An attenuation of viral transmission or pathogenicity during the epidemic course is suggested, likely due to restriction measures, although viral factors might also be considered.http://www.sciencedirect.com/science/article/pii/S1201971221000801COVID-19CoronavirusPandemicSARS-CoV-2Viral loadRT-PCR |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Moris Sangineto Fabio Arena Rosella De Nittis Rosanna Villani Crescenzio Gallo Gaetano Serviddio |
spellingShingle |
Moris Sangineto Fabio Arena Rosella De Nittis Rosanna Villani Crescenzio Gallo Gaetano Serviddio Temporal profile of SARS-CoV-2 viral load in posterior nasopharyngeal samples: Analysis of 944 patients in Apulia, Italy International Journal of Infectious Diseases COVID-19 Coronavirus Pandemic SARS-CoV-2 Viral load RT-PCR |
author_facet |
Moris Sangineto Fabio Arena Rosella De Nittis Rosanna Villani Crescenzio Gallo Gaetano Serviddio |
author_sort |
Moris Sangineto |
title |
Temporal profile of SARS-CoV-2 viral load in posterior nasopharyngeal samples: Analysis of 944 patients in Apulia, Italy |
title_short |
Temporal profile of SARS-CoV-2 viral load in posterior nasopharyngeal samples: Analysis of 944 patients in Apulia, Italy |
title_full |
Temporal profile of SARS-CoV-2 viral load in posterior nasopharyngeal samples: Analysis of 944 patients in Apulia, Italy |
title_fullStr |
Temporal profile of SARS-CoV-2 viral load in posterior nasopharyngeal samples: Analysis of 944 patients in Apulia, Italy |
title_full_unstemmed |
Temporal profile of SARS-CoV-2 viral load in posterior nasopharyngeal samples: Analysis of 944 patients in Apulia, Italy |
title_sort |
temporal profile of sars-cov-2 viral load in posterior nasopharyngeal samples: analysis of 944 patients in apulia, italy |
publisher |
Elsevier |
series |
International Journal of Infectious Diseases |
issn |
1201-9712 |
publishDate |
2021-03-01 |
description |
Objectives: The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic has heavily impacted Italy. The government's restriction measures have attenuated the burden on hospitals. The association of high viral replication with disease severity suggests the potential for lower viral load in milder clinical presentations. Methods: The reverse-transcription-polymerase-chain-reaction (RT-PCR) profile of 944 consecutive, non-replicate, positive retropharyngeal swabs was collected from 3 March to 8 June 2020 to investigate the temporal profile of SARS-CoV-2 viral load in the region of Capitanata, Apulia. Cycle threshold (Ct) values of 3 targets (N [nucleocapsid protein], E [envelope protein] and RdRP [RNA-dependent RNA-polymerase]) were analysed. Results: The median Ct values of the 3 targets increased considerably over the study period, showing a progressive and constant weekly change. The negative detection rate of E and RdRP increased over time. These data suggest that SARS-CoV-2 viral load progressively decreased along the outbreak course. During the first epidemic peak (March and April) the viral load among patients >80-years was significantly higher than for younger subjects. However, in May this age-dependent difference disappeared, underlying viral load reduction in the elderly. Conclusions: An attenuation of viral transmission or pathogenicity during the epidemic course is suggested, likely due to restriction measures, although viral factors might also be considered. |
topic |
COVID-19 Coronavirus Pandemic SARS-CoV-2 Viral load RT-PCR |
url |
http://www.sciencedirect.com/science/article/pii/S1201971221000801 |
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