They had a sample set of 2x 20 people. They were all healthcare workers. Though it might be an indicator this is not significant enough.
Significant enough for what?
Is recency of the last shot considered? It's looking more and more like mrna vaccines taper off over the course of six months or so, to some baseline of protection that significantly prevents hospitalization in a majority of cases, but it's hard to get a read on the data - there's so much cruft and badly designed experimentation, it seems like it will be years before clarity is achieved.
Oh no, think of the pharma profits!
In other news "SA is extremely vulnerable to C-19 with an average IFR of 0.5%. The IFR of Omicron is estimated at 0.053%."
4x less effective per serology. But that doesn't indicate severity of disease.