SARS Envelope antigen is suitable for ELISA and Western blots, excellent antigen for detection of SARS with minimal specificity problems. The E.coli derived;34 kDa recombinant protein contains the N-terminus Enevelope protein 1-76 amino acids immunodominant regions. 50mM Tris-HCl, 60mM NaCl, and 50% glycerol. SARS Envelope protein was purified by proprietary chromatographic technique. SARS Envelope protein is Immunoreactive with sera of SARS-infected individuals.