Table 3.

NASPA and previously determined ELLA titers for H1N1 vaccine viruses

NASPA titers for each virus were generated using the indicated ferret antisera (italics) and correspond to the highest dilution factor above the control mean + 3 SD. Titers for NAs matching the antisera are bold. ELLA titers in parenthesis are from a previous study using the same ferret sera and viruses³⁵. Antigenically similar, related, and distinct NAs based on two-way test results are highlighted in orange, light blue, and purple, respectively.