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Recognition of native HA in AIV H5-infected MDCK cells and baculovirus-expressed rHA1 (Bac/HA1) by MAbs 3D4 and 8B6 by IFA. MDCK and Sf-9 cells were infected with the H5 subtypes and recombinant baculoviruses, respectively. The controls were H9N2-infected MDCK cells and Sf-9 cells.
