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Volume 28, Number 1—January 2022
Research Letter

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

Maria Skaalum PetersenComments to Author , Marin Strøm, Jógvan Páll Fjallsbak, Jóhanna Ljósá Hansen, Sólrun Larsen, Eina H. Eliasen, Malan Johansen, Anna Sofía Veyhe, Marnar Fríðheim Kristiansen, and Pál Weihe
Author affiliations: The Faroese Hospital System, Tórshavn, Faroe Islands (M.S. Petersen, E.H. Eliasen, M. Johansen, A.S. Veyhe, P. Weihe); University of the Faroe Islands, Tórshavn (M.S. Petersen, M. Strøm, E.H. Eliasen, M. Johansen, A.S. Veyhe, M.F. Kristiansen, P. Weihe); Faroese Food and Veterinary Authority, Tórshavn (J.P. Fjallsbak, J.L. Hansen, S. Larsen); National Hospital of the Faroe Islands, Tórshavn (M.F. Kristiansen)

Main Article

Table

Characteristics of study participants compared with entire population and crude prevalence for severe acute respiratory syndrome coronavirus 2–specific antibodies, Faroe Islands, November 2020

Characteristics No. (%) sampled Total population (%) p value No. positive Crude seroprevalence, % (95% CI)*
Total
 960 (100)
 52,854 (100)
3
 0.3 (0.06–0.9)
Sex
M 459 (47.8) 27,380 (51.8) 0.014 1 0.2 (0.01–1.2)
F
 501 (52.2)
 25,474 (48.2)
 0.014
 2
 0.4 (0.05–1.4)
Age, y
0–9 33 (3.4) 7,259 (13.7) <0.0001 1 3.0 (0.08–15.8)
10–19 76 (7.9) 7,357 (13.9) <0.0001 0 0
20–29 88 (9.2) 5,983 (11.3) 0.0414 0 0
30–39 134 (14.0) 6,534 (12.4) 0.1364 0 0
40–49 135 (14.1) 6,554 (12.4) 0.1136 0 0
50–59 191 (19.9) 6,780 (12.8) <0.0001 0 0
60–69 157 (16.4) 5,685 (10.8) <0.0001 2 1.3 (0.2–4.5)
70–79 103 (10.7) 4,337 (8.2) 0.0053 0 0
80–89 36 (3.8) 1,875 (3.5) 0.6165 0 0
>90
 7 (0.7)
 490 (0.9)
 0.5147
 0
 0
Geographic area
Streymoy 473 (49.3) 25,288 (47.8) 0.3565 2 0.4 (0.05–1.5)
Eysturoy 216 (22.5) 11,966 (22.6) 0.9415 0 0
Norðoyggjar 114 (11.9) 6,278 (11.9) 1 0 0
Vágar 49 (5.1) 3,361 (6.4) 0.1023 0 0
Sandoy og Suðuroy 108 (11.2) 5,961 (11.3) 0.9227 1 0.9 (0.02–5.1)

*Exact 95% CI calculated by binomial regression.

Main Article

Page created: October 08, 2021
Page updated: December 20, 2021
Page reviewed: December 20, 2021
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