[rj9000]

I had to get the shingles vax just before I got on O due to reactivation risk despite being way too young.

I got COVID vaccine and while I had a symptomatic reaction, the results of my antibody tests were concerning. I had my antibodies checked at LabCorp (forget exactly which protein they checked for) and my antibody count was something like 20, while my wife (as the control) had around 12,000.

Some of the most recent research suggests even though the antibody levels are low, there is a good T Cell response still.

You don't lose any immunity you already had, but any potential future immunity is likely blunted.