re: PCR test gives false positives from colds and other viruses now confirmed.

LINK

LINK

My reading (and I may be wrong bc there is plenty of double-talk and innuendo) is that the tests cannot fell difference or effectiveness of antibodies from infection v. Vaccine. Initially, the tests only measured antibodies from infection, bc vaccines were not available initially. But, once available, the testing is nly detects the presence of absence of antibodies (proteins) from vaccine and infection (first bullet point under first heading).