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Antibody reactivity to SARS-CoV-2 in adults from the Vancouver metropolitan area, Canada (preprint)
medrxiv; 2020.
Preprint
in English
| medRxiv | ID: ppzbmed-10.1101.2020.10.05.20206664
ABSTRACT
Background:
Quantifying antibody reactivity to SARS-CoV-2 antigens may help understand its effect on COVID-19 severity at the population level. This antibody reactivity may be particularly prevalent among childcare providers, including pediatric health care workers (HCW) who may be more exposed to circulating coronaviruses.Methods:
Cross-sectional study that included adults in the Vancouver area in British Columbia (BC), Canada, between May 17 and June 19, 2020. A novel 10-plex antibody assay (IgG) was used to measure antibody reactivity against the spike protein from circulating coronaviruses (229E, NL63, OC43, and HKU1), SARS-CoV, and four SARS-CoV-2 antigens. Seroreactivity from previous viral exposure was ascertained using this assay, and by measuring total SARS-CoV-2 IgG/M/A antibodies against a recombinant spike (S1) protein using a commercial CLIA assay.Findings:
Among 276 participants (71% HCW), three showed evidence of direct viral exposure, yielding an adjusted seroprevalence of 0.6% [95%CI 0.2 to 3.1%], with no difference between HCW and non-HCW, or between paediatric and adult HCW. Among the remaining 273 unexposed individuals, 7.3% [95%CI 4.5% to 11.1%], 48.7 [95%CI 42.7% to 54.8%] and 82.4% [95%CI 77.4% to 86.7%] showed antibody reactivity against SARS-CoV-2 RBD, N or Spike proteins, respectively. This reactivity was evenly distributed as a function of age, sex or between paediatric and adult HCW, and partly correlated with reactivity to circulating coronaviruses (Spearman; range 0.147 to 0.513 for significant correlation after false-discovery rate adjustment at 5%).Interpretation:
A substantial proportion of individuals in this population showed antibody reactivity against SARS-CoV-2 antigens despite low serological evidence of SARS-CoV-2 exposure.
Full text:
Available
Collection:
Preprints
Database:
medRxiv
Main subject:
Severe Acute Respiratory Syndrome
/
Poult Enteritis Mortality Syndrome
/
COVID-19
Language:
English
Year:
2020
Document Type:
Preprint
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