Three representative yeast clones displaying antigenic peptides G-15, G-55, and H-11, obtained from the screening against the goat antisera and human plasma samples, were characterized for neutralization titers (IC 50 ) by testing protection efficacy to MDCK cells from the A/reassortant/NYMC X-179A/California/07/ 2009(H1N1) exposure. Cells containing pCTCON2 were used as absorbent controls for evaluation of background IC 50 values. HA1 and HA2 were also incorporated to determine the ability of the globular head and stem regions to absorb antibodies in the antisera. As summarized in Table S1 , all single clones reduced the IC 50 of the corresponding antisera, demonstrating qualitatively the neutralization efficacy of these antigenic peptides.