Figure 2From: Potent and persistent antibody responses against the receptor-binding domain of SARS-CoV spike protein in recovered patientsPersistent RBD-specific antibody responses in the recovered SARS patients. The sequential samples were collected from 19 recovered SARS patients enrolled for a follow-up study. The sera were tested at 1/100 dilution by ELISA with RBD-His protein as a coating antigen or by the viral lysate-based diagnostic kit.Back to article page