What does the presence of HepB surface antibody indicate?

The presence of Hepatitis B surface antibody (anti-HBs) indicates that an individual has either recovered from a Hepatitis B infection or has been vaccinated against it. This antibody is an indication of immunity to the virus.

In the case of recovery from an infection, the presence of anti-HBs means that the immune system has effectively fought off the virus, leading to a resolution of the infection and the development of immunity. Alternatively, vaccination against Hepatitis B leads to the production of this antibody, which also signifies immunity without the individual having been exposed to the actual virus.

Understanding the significance of Hepatitis B surface antibody levels is crucial for determining a person's immune status. If present, it demonstrates that the individual does not have an active infection and has the necessary protection against future infections.