Yes with J&J

I think that's probably the key part: the vaccination discussion has generally conflated two parts — neutralizing antibodies are what help you avoid getting sick at all but those wane over time, whereas the T cell response which helps you quickly fight off an infection lasts far longer. That has been very poorly communicated because a lot of the public health people have been focused on containing spread and T cells do not keep you from being contagious but that's really what we should be communicating: get vaccinated and this becomes a lot more similar to influenza.

Well, T cells help a bit because they generally lessen the time for which you are contagious.

Definitely - they’re just not enough to act as a wall for something this contagious.