Contribution of infection and vaccination to population-level seroprevalence through two COVID waves in Tamil Nadu, India.


Journal

Scientific reports
ISSN: 2045-2322
Titre abrégé: Sci Rep
Pays: England
ID NLM: 101563288

Informations de publication

Date de publication:
24 Jan 2024
Historique:
received: 11 04 2023
accepted: 19 12 2023
medline: 25 1 2024
pubmed: 25 1 2024
entrez: 24 1 2024
Statut: epublish

Résumé

This study employs repeated, large panels of serological surveys to document rapid and substantial waning of SARS-CoV-2 antibodies at the population level and to calculate the extent to which infection and vaccination separately contribute to seroprevalence estimates. Four rounds of serological surveys were conducted, spanning two COVID waves (October 2020 and April-May 2021), in Tamil Nadu (population 72 million) state in India. Each round included representative populations in each district of the state, totaling ≥ 20,000 persons per round. State-level seroprevalence was 31.5% in round 1 (October-November 2020), after India's first COVID wave. Seroprevalence fell to 22.9% in round 2 (April 2021), a roughly one-third decline in 6 months, consistent with dramatic waning of SARS-Cov-2 antibodies from natural infection. Seroprevalence rose to 67.1% by round 3 (June-July 2021), with infections from the Delta-variant induced second COVID wave accounting for 74% of the increase. Seroprevalence rose to 93.1% by round 4 (December 2021-January 2022), with vaccinations accounting for 63% of the increase. Antibodies also appear to wane after vaccination. Seroprevalence in urban areas was higher than in rural areas, but the gap shrunk over time (35.7 v. 25.7% in round 1, 89.8% v. 91.4% in round 4) as the epidemic spread even in low-density rural areas.

Identifiants

pubmed: 38267448
doi: 10.1038/s41598-023-50338-3
pii: 10.1038/s41598-023-50338-3
doi:

Types de publication

Journal Article

Langues

eng

Sous-ensembles de citation

IM

Pagination

2091

Informations de copyright

© 2024. The Author(s).

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Auteurs

T S Selvavinayagam (TS)

Directorate of Public Health and Preventative Medicine, Government of Tamil Nadu, Chennai, Tamil Nadu, India.

Anavarathan Somasundaram (A)

Institute of Community Medicine, Madras Medical College, Chennai, Tamil Nadu, India.

Jerard Maria Selvam (JM)

Directorate of Public Health and Preventative Medicine, Government of Tamil Nadu, Chennai, Tamil Nadu, India.

P Sampath (P)

Directorate of Public Health and Preventative Medicine, Government of Tamil Nadu, Chennai, Tamil Nadu, India.

V Vijayalakshmi (V)

Directorate of Public Health and Preventative Medicine, Government of Tamil Nadu, Chennai, Tamil Nadu, India.

C Ajith Brabhu Kumar (CAB)

Directorate of Public Health and Preventative Medicine, Government of Tamil Nadu, Chennai, Tamil Nadu, India.

Sudharshini Subramaniam (S)

Institute of Community Medicine, Madras Medical College, Chennai, Tamil Nadu, India.

Parthipan Kumarasamy (P)

Directorate of Public Health and Preventative Medicine, Government of Tamil Nadu, Chennai, Tamil Nadu, India.

S Raju (S)

Directorate of Public Health and Preventative Medicine, Government of Tamil Nadu, Chennai, Tamil Nadu, India.

R Avudaiselvi (R)

Directorate of Public Health and Preventative Medicine, Government of Tamil Nadu, Chennai, Tamil Nadu, India.

V Prakash (V)

Directorate of Public Health and Preventative Medicine, Government of Tamil Nadu, Chennai, Tamil Nadu, India.

N Yogananth (N)

Directorate of Public Health and Preventative Medicine, Government of Tamil Nadu, Chennai, Tamil Nadu, India.

Gurunathan Subramanian (G)

Directorate of Public Health and Preventative Medicine, Government of Tamil Nadu, Chennai, Tamil Nadu, India.

A Roshini (A)

Directorate of Public Health and Preventative Medicine, Government of Tamil Nadu, Chennai, Tamil Nadu, India.

D N Dhiliban (DN)

Directorate of Public Health and Preventative Medicine, Government of Tamil Nadu, Chennai, Tamil Nadu, India.

Sofia Imad (S)

Artha Global, Mumbai, Maharashtra, India.

Vaidehi Tandel (V)

Henley Business School, University of Reading, Reading, UK.

Rajeswari Parasa (R)

Artha Global, Mumbai, Maharashtra, India.

Stuti Sachdeva (S)

World Bank, Washington D.C., USA.

Sabareesh Ramachandran (S)

University of California, San Diego, CA, USA.

Anup Malani (A)

University of Chicago, Chicago, IL, USA. amalani@uchicago.edu.

Classifications MeSH