Similar to the other article I sited, "we were unable to evaluate immune memory in those with the extreme presentations, both asymptomatic and severe COVID-19"

So unfortunately since I specifically and repeatedly referred to asymptomatic cases, which are relatively common in those under 30, it is not good enough.

If I could edit my original post to <B>BOLD</B> asymptomatic even more, I would, since I highly doubt you're going to find many studies on that group.