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Reactive serology results for HBsAb (Hepatitis B surface antibody) indicate that an individual has developed immunity against the Hepatitis B virus. This immunity can be a result of either a past infection that has resolved or vaccination against Hepatitis B. When HBsAb is detected, it signifies that the person's immune system has successfully responded to either the virus or the vaccine, generating antibodies that can neutralize the virus if encountered again.

In the context of hepatitis B, the presence of HBsAb means that the individual is not currently infected with the virus; rather, they have developed immunity and are, therefore, considered immune but not infectious. This is an important distinction because it can guide clinical decisions regarding patient management and public health policies.