Figure 2.

Persistent 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.

Cao et al. Virology Journal 2010 7:299   doi:10.1186/1743-422X-7-299
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