XY102, 6F12, KB2, 9H10, and 29E3 have been previously described (29 (link)– (link)32 (link), 34 (link)). Chimeric IgG and IgA antibodies were generated as previously described (36 (link)). Briefly, the variable regions of the group 1 HA stalk-binding monoclonal antibodies 6F12 and KB2 were cloned into human IgG and IgA backbones (pFUSE; InvivoGen). An identical strategy was used for 29E3, a strain-specific antibody that recognizes the head domain of A/California/04/09 HA.
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