Potent RBD-specific antibody responses in the recovered SARS patients. The convalescent sera from 30 SARS patients and normal sera from 25 healthy blood donors were tested at 1/100 dilution by ELISA with RBD-His protein as a coating antigen. The dashed line represents a cutoff value (the mean absorbance at 450 nm of sera from healthy blood donors plus 3 SDs).
Cao et al. Virology Journal 2010 7:299 doi:10.1186/1743-422X-7-299