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Analysis of antibody binding from COVID-19 and SARS sera against seven recombinant proteins. Show on the Y-axis are net mean florescence (MFI) units normalised with those obtained from anti-His antibody readings for each protein (see Methods for detail). The serum panels includes 37 healthy controls, 74 sera from PCR positive COVID-19 patients, and 18 recovered SARS patients. The SARS sera were divided into those sampled in 2003 (<1 year, n=7) or 2020 (≥17 years n=11).
