Are you talking about antibodies? There are papers on T-cell immunity and clicks who've tested staff a month apart with no increase in antibody positive tests.

Are you talking about antibodies? There are papers on T-cell immunity and clicks who've tested staff a month apart with no increase in antibody positive tests. It's probably WELL over 10%. There are more ways our immune system can develop memory than just antibodies and a number of studies are showing that.