Volume 11, Number 3—March 2005
SARS-associated Coronavirus Transmitted from Human to Pig
|Virus strains||Sera (ND50)
*S1 and S2 were sera from swine that were positive by enzyme-linked immunosorbent assay (ELISA). H1 and H2 were sera from SARS patients. H3 and S3 were controls from sera of a normal human and an ELISA-negative pig, respectively. ND50, 50% neutralization dose.