Battelle 1 article published in JoVE Immunology and Infection Measuring Influenza Neutralizing Antibody Responses to A(H3N2) Viruses in Human Sera by Microneutralization Assays Using MDCK-SIAT1 Cells F. Liaini Gross1,2, Yaohui Bai1, Stacie Jefferson1, Crystal Holiday1, Min Z. Levine1 1Influenza Division, Centers for Disease Control and Prevention, 2Battelle Influenza neutralizing antibodies correlate with protection of influenza infections. Microneutralization assays measure neutralizing antibodies in human sera and are often used for influenza human serology. We describe a microneutralization assay using MDCK-SIAT1 cells to measure neutralizing antibody titers to contemporary 3C.2a and 3C.3a A(H3N2) viruses following influenza vaccination or infection.