False positive COVID tests (+Rapid Ag; neg PCR) are rare, 1.7% of 11,297 tests; Persistent false positives seen in 13/191 and usually in women, with autoimmune dz (6/13; RA, SLE etc) & using the Quidel QuickVue rapid antigen test https://t.co/Pqkk7uBVcO https://t.co/m6ylQz00Ih