It appears that originally they tested for antibodies in hopes of showing that lot's of people were still vulnerable to getting ChiCom Flu. Then when they saw that so many have already had it, with little or no effects (meaning that so many people were already immune to getting it, and that even if you got it now it's not that bad especially with the cure and prevention known to exist and be inexpensive) they desperately need to change the narrative in order to scare people into accepting the no-ID and mail-in voting....