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J Infect Dis ; 225(10): 1688-1693, 2022 05 16.
Article in English | MEDLINE | ID: covidwho-1853095


We compared the ability of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike-specific antibodies to induce natural killer cell-mediated antibody-dependent cellular cytotoxicity (ADCC) in patients with natural infection and vaccinated persons. Analyzing plasma samples from 39 coronavirus disease 2019 (COVID-19) patients and 11 vaccinated individuals, significant induction of ADCC could be observed over a period of more than 3 months in both vaccinated and recovered individuals. Although plasma antibody concentrations were lower in recovered patients, we found antibodies elicited by natural infection induced a significantly stronger ADCC response compared to those induced by vaccination, which may affect protection conferred by vaccination.

COVID-19 , SARS-CoV-2 , Antibodies, Neutralizing , Antibodies, Viral , Antibody-Dependent Cell Cytotoxicity , COVID-19/prevention & control , Humans , Killer Cells, Natural , Spike Glycoprotein, Coronavirus , Vaccination
Nat Commun ; 12(1): 1931, 2021 03 26.
Article in English | MEDLINE | ID: covidwho-1152851


The COVID-19 pandemic continues to have an unprecedented impact on societies and economies worldwide. There remains an ongoing need for high-performance SARS-CoV-2 tests which may be broadly deployed for infection monitoring. Here we report a highly sensitive single molecule array (Simoa) immunoassay in development for detection of SARS-CoV-2 nucleocapsid protein (N-protein) in venous and capillary blood and saliva. In all matrices in the studies conducted to date we observe >98% negative percent agreement and >90% positive percent agreement with molecular testing for days 1-7 in symptomatic, asymptomatic, and pre-symptomatic PCR+ individuals. N-protein load decreases as anti-SARS-CoV-2 spike-IgG increases, and N-protein levels correlate with RT-PCR Ct-values in saliva, and between matched saliva and capillary blood samples. This Simoa SARS-CoV-2 N-protein assay effectively detects SARS-CoV-2 infection via measurement of antigen levels in blood or saliva, using non-invasive, swab-independent collection methods, offering potential for at home and point of care sample collection.

COVID-19 Testing/methods , COVID-19/diagnosis , Coronavirus Nucleocapsid Proteins/blood , SARS-CoV-2/metabolism , Saliva/virology , COVID-19/epidemiology , COVID-19/virology , Coronavirus Nucleocapsid Proteins/genetics , Epidemics , Home Care Services , Humans , Point-of-Care Systems , ROC Curve , SARS-CoV-2/genetics , SARS-CoV-2/physiology , Specimen Handling/methods