From Why am I still sick in the write up with this post - Eva Sapi explains how spirochetes can morph into biofilms, or even intracellular bacteria.
Later in my off-camera interviews with Dr. Eva Sapi, she explained that sub-MIC (less than the effective doses) of doxycycline can actually cause Borrelia Burgdorferi spirochetes to change forms – morph -- and “hibernate” into cyst forms. There, they survive indefinitely in sleeper cells, literally.