Widely recognize Influenza B Nucleoprotein. Has cross-reactivity in ELISA and WB with: Influenza B (B/Austria/1359417/2021) NP Protein; Influenza B (B/Brisbane/60/2008) NP; Influenza B (B/Colorado/06/2017) NP; Influenza B (B/Florida/4/2006) NP; Influenza