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Ghosh A, Kanta P, Ramola M, Mohindra R, Goyal K, Kishore R, Suri V, Lakshmi PVM, Chauhan C, Sharma M, Rakshit P, Ponnusamy K, Dikid T, Singh MP. Rapid Decline of SARS-CoV-2 Viral Load in Single vs. Double-Dose (Short-Interval <6 Weeks) ChAdOx nCoV-19 Vaccinated Health-Care Workers. Curr Microbiol 2024; 81:95. [PMID: 38353761 DOI: 10.1007/s00284-023-03603-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Accepted: 12/26/2023] [Indexed: 02/16/2024]
Abstract
The present work was carried out during the emergence of Delta Variant of Concern (VoC) and aimed to study the change in SARS CoV-2 viral load in Covishield vaccinated asymptomatic/mildly symptomatic health-care workers (HCWs) to find out the optimum isolation period. The SARS CoV-2 viral load was carried out in sequential samples of 55 eligible HCWs which included unvaccinated (UnV; n = 11), single-dose vaccinated (SDV, n = 20) and double-dose vaccinated [DDV, n = 24; short-interval (<6 weeks)] subjects. The mean load of envelope (E) gene on day 5 in SDV [0.42 × 105 copies/reaction] was significantly lower as compared to DDV [6.3 × 105 copies/reaction, P = 0.005] and UnV [6.6 × 105 copies/reaction, P = 0.001] groups. The rate of decline of SARS CoV-2 viral load in the initial 5 days of PCR positivity was significantly higher in SDV as compared to that in DDV (Mean log decline 0.39 vs. 0.19; P < 0.001). This was possibly due to interference of adenoviral immunity of first dose of adenovirus-vectored vaccine in double-dose vaccinated HCWs who had received vaccines within a shorter interval (<6 weeks).
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Affiliation(s)
- Arnab Ghosh
- Department of Virology, Post-Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - Poonam Kanta
- Department of Virology, Post-Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - Manisha Ramola
- Department of Virology, Post-Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - Ritin Mohindra
- Department of Internal Medicine, Post-Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - Kapil Goyal
- Department of Virology, Post-Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - Roop Kishore
- Department of Internal Medicine, Post-Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - Vikas Suri
- Department of Internal Medicine, Post-Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - P V M Lakshmi
- Department of Community Medicine and School of Public Health, Post-Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - Chanderkanta Chauhan
- Department of Community Medicine and School of Public Health, Post-Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - Manisha Sharma
- Department of Community Medicine and School of Public Health, Post-Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
| | - Partha Rakshit
- National Centre for Disease Control (NCDC), New Delhi, India
| | | | - Tanzin Dikid
- National Centre for Disease Control (NCDC), New Delhi, India
| | - Mini P Singh
- Department of Virology, Post-Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India.
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