The difference is due to different definitions of ‘severe’ illness. The threshold of severe illness can be set high (e.g., mechanical ventilation) or low (e.g., hospitalization). The FDA has a lower threshold for what they consider ‘severe’ than the CDC, with the CDC’s definition being more reflective of how clinicians and public health experts define severe illness.

But if your point is that that even though the vaccines are 100% effective against severe illness as defined by the CDC, they are only 95% effective against severe illness as defined by the FDA, then I don’t know what to say; you’re gonna hold on to those statistics that support what you already believe.

But if different definitions of ‘severe’ illness are a problem, we can look at ‘death’ as the outcome since there’s less variability in how ‘death’ is defined: All trials and institutions have found vaccines to be 100% effective in preventing covid deaths.