Seroprevalence of SARS-CoV-2–Specific Antibodies among Quarantined Close Contacts of COVID-19 Patients, Faroe Islands, 2020

• Published in: Emerging Infectious Diseases
• Main Authors: Maria Skaalum Petersen, Marnar Fríðheim Kristiansen, Halla Weihe Reinert, Jógvan Páll Fjallsbak, Debes Hammershaimb Christiansen, Shahin Gaini, Bjarni á Steig, Lars Fodgaard Møller, Marin Strøm, Pál Weihe
• Format: Article in Journal/Newspaper
• Language: English
• Published: Centers for Disease Control and Prevention 2021
• Subjects: SARS-CoV-2 seroprevalence; close contacts; Faroe Islands; secondary attack rate; SARS-CoV-2; COVID-19; Medicine; R; Infectious and parasitic diseases; RC109-216
• Online Access: https://doi.org/10.3201/eid2711.204948; https://doaj.org/article/347b95c914674ae3b940bfc386d07771

Close contacts of coronavirus disease (COVID-19) patients are at high risk for severe acute respiratory syndrome 2 (SARS-CoV-2) infection. We assessed the seroprevalence of SARS-CoV-2–specific antibodies among quarantined close contacts of COVID-19 patients in the Faroe Islands. We invited quarantined close contacts of COVID-19 index patients identified during March 3–April 22, 2020, to participate in this study; 584 (81%) contacts consented and underwent serologic testing. Among the 584 participants, 32 (5.5%) were seropositive for total antibody against SARS-CoV-2. Household and young or elderly contacts had higher risk for seropositivity than other contacts. We found a secondary attack rate of 19.2%. Seroprevalence among close contacts was almost 10-fold higher than among the general population of the Faroe Islands. Regularly testing household close contacts of COVID-19 patients might help track the transmission of SARS-CoV-2.