SMOC1 and infection: Unlike infection by V4 alone, which elicited higher HAI titers toward itself than to most viruses in the panel (Figure 5A), ferret antisera induced after additional prior exposures had HAI GMTs toward V4 not higher than those toward the earlier infection strains (Figure 5B–D), a typical OAS response that was also seen for every sequence of infections in Figure 3B–D.