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Review Question - QID 213417

In scope icon M 6 B
QID 213417 (Type "213417" in App Search)
A 35-year-old male anesthesiologist presents to the occupational health clinic after a needlestick exposure while obtaining an arterial line in a patient with cirrhosis. In addition to a standard bloodborne pathogen laboratory panel sent for all needlestick exposures at his hospital, additional hepatitis panels are ordered upon the patient's request. The patient's results are shown below:

HIV 4th generation Ag/Ab: Negative/Negative
Hepatitis B surface antigen (HBsAg): Negative
Hepatitis C antibody: Negative
Anti-hepatitis B surface antibody (HBsAb): Positive
Anti-hepatitis B core IgM antibody (HBc IgM): Negative
Anti-hepatitis B core IgG antibody (HBc IgG): Positive

What is the most likely explanation of the results above?