“Another member of my family had tested positive for antibodies, but just recently tested negative.”
Even after antibodies fade you should still have T cells that last much longer. Maybe forever. If I understand how T cells function, they kill cells that are infected with the virus. This could provide long lasting natural immunity.
https://www.virology.ws/2021/03/25/t-cells-will-save-us-from-covid-19/
That’s very interesting. Thanks.