That happens when the early antibodies fade away and the T-Cell immunity hasn’t yet kicked fully in.
48% of immunized people can get COVID-19 during that time.
What does "can" get covid mean? People either get it, whatever "it" is, or they don't. If they don't get it, then why are they in the 48%? And what if they get "it" a month later? What about those with some sort of natural immunity? Are they included in the 52%? How many people are in one of these trials anyway? Are they double-blind? Can we be sure it's 52% and not 51% or 53%?
Did you ever take a course in statistics?
ML/NJ