aRT-PCR positive was defined as visible SMV-specific
amplified PCR product on agarose gel in the study with Inoculum 1
bRT-qPCR positive was defined as CT values< 40 in duplicate reactions in the study with Inoculum 2
cChi-square test
dFisher’s exact test
“-“ Statistical analysis was not performed due to small sample size
eSerum conversion was defined as anti-SMV serum IgG
conversion (>4 fold) by ELISA in any post-challenge serum
sample vs. pre-challenge serum sample