Abstract
The neutralization immunofluorescence test (NIFT), currently used for detecting neutralizing antibodies (NAbs) against classical swine fever virus (CSFV), is time-consuming. Here, a simplified neutralization test based on enhanced green fluorescent protein (EGFP)-tagged CSFV (EGFP-NT) was developed for direct detection of anti-CSFV NAbs without immunostaining. The relative sensitivity and specificity between EGFP-NT and NIFT or blocking enzyme-linked immunosorbent assay (ELISA) were both 100%. The NAb titers by EGFP-NT and the blocking rates by blocking ELISA showed a good correlation.