Low Seroprevalence among Undetected COVID-19 Cases, Faroe Islands, November 2020

Petersen, Maria Skaalum; Strøm, Marin; Fjallsbak, Jógvan Páll; Hansen, Jóhanna Ljósá; Larsen, Sólrun; Eliasen, Eina H.; Johansen, Malan; Veyhe, Anna Sofía; Kristiansen, Marnar Fríðheim; Weihe, Pál

doi:10.3201/eid2801.210917

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…A control group, defined as individuals without SARS-CoV-2 in December 2021 and January 2022, was invited from participants in two former seroprevalence studies conducted in April 2020 and November 2020 ( Petersen et al , 2022 ), with 1075 and 960 participants, respectively, from which we had email addresses for the most. We did not have information about their COVID-19 status; only those not infected with SARS-COV-2 in December 2021 or January 2022 were eligible to participate.…”

Section: Data Collectionmentioning

confidence: 99%

See 1 more Smart Citation

Clinical characteristics of the Omicron variant - results from a Nationwide Symptoms Survey in the Faroe Islands

Petersen

Kongsstovu

Eliasen

et al. 2022

International Journal of Infectious Diseases

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Section: Data Collectionmentioning

confidence: 99%

“…Characteristics of the study populations are listed in Table 1 . Email addresses were available from ∼1700 controls from two previous seroprevalence studies Petersen et al, 2022 ). An unknown number of these were not eligible as they had been infected with SARS-CoV-2 in December 2021 and January 2022.…”

Section: Participantsmentioning

confidence: 99%

Clinical characteristics of the Omicron variant - results from a Nationwide Symptoms Survey in the Faroe Islands

Petersen

Kongsstovu

Eliasen

et al. 2022

International Journal of Infectious Diseases

Self Cite

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Age-stratified infection fatality rate of COVID-19 in the non-elderly population

Pezzullo

Axfors²,

Contopoulos‐Ioannidis³

et al. 2023

Environmental Research

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Differential COVID-19 infection rates in children, adults, and elderly: evidence from 38 pre-vaccination national seroprevalence studies

Axfors

Pezzullo

Contopoulos‐Ioannidis

et al. 2022

Preprint

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Background: COVID-19 exhibits a steep age gradient of infection fatality rate. There has been debate about whether extra protection of elderly and other vulnerable individuals (precision shielding) is feasible, and, if so, to what extent. Methods: We used systematically retrieved data from national seroprevalence studies conducted in the pre-vaccination era. Studies were identified through SeroTracker and PubMed searches (last update May 17, 2022). Studies were eligible if they targeted representative general populations without high risk of bias. Seroprevalence estimates were noted for children, non-elderly adults, and elderly adults, using cut-offs of 20, and 60 years (or as close to these ages, if they were not available). Results: Thirty-eight national seroprevalence studies from 36 different countries were included in the analysis. 26/38 also included pediatric populations. 25/38 studies were from high-income countries. The median ratio of seroprevalence in the elderly versus non-elderly adults (or non-elderly in general, if pediatric and adult population data were not offered separately) was 0.90-0.95 in different analyses with large variability across studies. In 5 studies (all of them in high-income countries), there was significant protection of the elderly with ratio <0.40. The median was 0.83 in high-income countries and 1.02 in other countries. The median ratio of seroprevalence in children versus adults was 0.89 and only one study showed a significant ratio of <0.40. Conclusion: Precision shielding of elderly community-dwelling populations before the availability of vaccines was feasible in some high-income countries, but most countries failed to achieve any substantial focused protection of this age group.

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Low Seroprevalence among Undetected COVID-19 Cases, Faroe Islands, November 2020

Cited by 5 publications

References 9 publications

Clinical characteristics of the Omicron variant - results from a Nationwide Symptoms Survey in the Faroe Islands

Clinical characteristics of the Omicron variant - results from a Nationwide Symptoms Survey in the Faroe Islands

Age-stratified infection fatality rate of COVID-19 in the non-elderly population

Differential COVID-19 infection rates in children, adults, and elderly: evidence from 38 pre-vaccination national seroprevalence studies

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