Recognize SARS-CoV-2 Spike S1-NTD. Doesn't recognize SARS-CoV-2 Spike RBD and S2. Has cross-reactivity with SARS-CoV.. Has cross-reactivity in ELISA and WB with: SARS-COV-2 Omicron (KP.2) Spike S1+S2 trimer Protein; SARS-CoV-2 Spike S1+S2 ECD-His; SARS-C