. 2021 Jun 23;39(28):3724–3730. doi: 10.1016/j.vaccine.2021.05.047

Table 1.

Summary of Neutralization Assay Methods in the Collaborative Calibration Labs.

Lab	Introduction of Method	Detection of Result
WS1,ZX,SZ,ZA,ZC,ZW,JW,JS1,BS,ZY1	Virus:SARS-CoV-2 pseudo virus,Cell:Huh-7	Relative light unit
BK	Virus:SARS-CoV-2, CZ01 (non-vaccine strain),Cell:Vero	Cytopathic effect
JS2	Virus:SARS-CoV-2, serial No. GWHABKZ01000000 (non-vaccine strain),Cell:Vero-E6	Cytopathic effect, OD₅₇₀ after staining with crystal violet
ZY2	Virus:SARS-CoV-2, KMS2 (non-vaccine strain),Cell:Vero	Cytopathic effect
WS2	Virus:SARS-CoV-2, WIV04 (vaccine strain),Cell:Vero	Plaques
WS3	Virus:SARS-CoV-2, WIV04 (vaccine strain),Cell:Vero	Cytopathic effect

Abbreviations: OD, optical density; SARS-CoV-2: Severe Acute Respiratory Coronavirus-2