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Viral Load in of Patients Vaccinated with Various Vaccination Schemes

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Abstract

It is still unclear how the SARS-CoV-2 viral loads in breakthrough infections that develop in individuals vaccinated with COVID-19. Recent studies have reported different results regarding breakthrough infections’ SARS-CoV-2 viral loads when compared to unvaccinated cases. This study aimed to analyze the viral loads of the partially vaccinated, fully vaccinated and boostered subjects vaccinated with different vaccine protocols including the CoronaVac vaccine, by comparing the Ct values. The data of laboratory-confirmed SARS-CoV-2 patients were analyzed in this study where the Ct values in those of unvaccinated fully, vaccinated with two doses of CoronaVac or two doses of BioNTech, partially vaccinated with one dose of CoronaVac or one dose of BioNTech or boosted with CoronaVac or BioNTech were compared. Based on the time elapsed after vaccination, Ct values at 15–90 days, 91–150 days, 151–210 days, and > 211 days were evaluated. A total of 2643 patients, 1839 of whom were vaccinated and 804 were unvaccinated, were included. Among these groups, the Ct value at 15–90 days in group who had a dose of BionTech booster after 2 doses of CoronaVac was significantly higher Ct value at 91–150 days in group who had two doses of CoronaVac (p = 0.021). No other statistically significant difference was found between the groups. In conclusion, fully vaccinated or boosted with CoronaVac or BioNTech vaccine does not reduce the viral load in breakthrough infections.

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Authors and Affiliations

  1. Department of Pediatric Infectious Disease, Ankara City Hospital, Yildirim Beyazit University, Children’s Hospital, Ankara, Turkey

    Gülsüm İclal Bayhan

  2. Department of Internal Medicine, Ankara City Hospital, Ankara, Turkey

    Enes Seyda Şahiner, Muhammet Göv, Merve Feyza Demir Gürdal & İhsan Ateş

  3. Department of Microbiology, Ankara City Hospital, Ankara, Turkey

    Irmak Özkubat Korkmaz, Ayşegül Zehra Uyan Erten, Fisun Kırca & Bedia Dinç

  4. Division of Intensive Care, Department of Internal Medicine, Ankara City Hospital, Ankara, Turkey

    Ahmet Gökhan Akdağ

  5. Department of Pediatric Infectious Disease, Ankara City Hospital, Ankara, Turkey

    Aysun Yahsi

Authors
  1. Gülsüm İclal Bayhan
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  2. Enes Seyda Şahiner
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  3. Irmak Özkubat Korkmaz
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  4. Muhammet Göv
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  5. Ahmet Gökhan Akdağ
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  7. Ayşegül Zehra Uyan Erten
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  8. Merve Feyza Demir Gürdal
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  10. Bedia Dinç
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  11. İhsan Ateş
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Contributions

Study conception and design: GİB, BD, ESS, data collection: IOK, MG, AZUE, MFDG; analysis and interpretation of results: GİB, AY, AGA, İA; draft manuscript preparation: FK, GİB.

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Correspondence to Gülsüm İclal Bayhan.

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Received from Ankara City Hospital Ethics committee.

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Bayhan, G.İ., Şahiner, E.S., Özkubat Korkmaz, I. et al. Viral Load in of Patients Vaccinated with Various Vaccination Schemes. SN Compr. Clin. Med. 5, 171 (2023). https://doi.org/10.1007/s42399-023-01511-2

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  • DOI: https://doi.org/10.1007/s42399-023-01511-2

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