An explanation of how the body's immune system is setup, and what role antibody testing plays in declaring someone "ok"   

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CDC Hepatitis B serology: https://www.cdc.gov/hepatitis/hbv/pdfs/serologicchartv8.pdf 

Wikipedia graph of Hepatitis B serology evolution: https://en.wikipedia.org/wiki/Hepatitis_B#/media/File:HBV_serum_markers.png

WHO article on immunity testing: https://www.who.int/immunization/documents/WHO_IVB_13.01/en/