I just found out this week that I don't have the antibodies even though I had the vaccine in March. I also found out that some of my specific T-cells are lower than normal. Likely a side effect from chemotherapy, which was finished in February. Just a PSA that these tests are not included with the normal white cell/neutrophils tests that they give cancer patients. So if you know someone, they might want to ask for an antibodies test and cd4/cd8 test