They do not use an antibody test to determine if you are currently infected. The tests used for people who have received the “vaccines” are “oversampled” a lesser number of times than those who have not been vaccinated by current CDC protocol. So the false positive rate is much lower. She most likely has the Delta Variant which is now the most prevalent strain. It is far more contagious, but far less dangerous.
All of the vaccines have now declined in effectiveness to the point where no one should expect them to keep them from coming down with a coronavirus infection. Good hygiene (hand washing etc.) avoiding enclosed spaces with others and staying away from those who appear to have a cold would be your best bet. And there are other known risks such as vitamin D deficiency and other health issues that make you more vulnerable.
Prayers for mother and child.
Different places have used different tests all through this debacle. This was one of the tests used over the last year and a half.
The do look for random segments of the virus. I assume anyone producing spike protein would test positive. Half life of mRNA is 8-10 days depending on who you listen to.
Giant BS circle jerk.