Fig. 4From: HAI and NAI titer correlates of inactivated and live attenuated influenza vaccine efficacyEvervax modifies the association between Day 0 NAI and influenza risk with decreasing strength in the placebo arm. The shaded area is the pointwise 95% confidence region for the risk function among Evervax=NO in the placebo group. The slopes of the other three risk functions are not significantly different from 0Back to article page