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False positive serology of prepandemic chagasic samples with SARS-CoV-2 antigen
Juan D H Zuluaga1, Juan C Santos-Barbosa1, Adriana Cuellar2
1Laboratorio de Ciencias Básicas Médicas, School of Medicine, Universidad de Los Andes, Bogotá DC, Colombia.
Objective:
To determine whether prepandemic sera from patients with Chagas disease recognise SARS-CoV-2 antigens.
Materials And Methods:
Forty sera from patients with Chagas disease were tested for the presence of IgG cross-reactivity against the nucleocapsid protein (NP) and spike (S) SARS-CoV-2 proteins by ELISA. Positive samples were tested again using a different ELISA and CLIA, both against NP.
Results:
None of the sera from patients with Chagas disease, previously confirmed as positive for the presence of anti-Trypanosoma cruzi antibodies reacted against the SARS-CoV-2 S protein, and six samples tested positive for the NP antigen (15%). The six positive samples were re-tested, five remained positive by ELISA and all were negative by CLIA.
Conclusion:
According to our data, false-positive results might be a concern in the detection of SARS-CoV-2 antibodies in patients with Chagas disease.
