Hepatitis B surface antibody - A "positive" or "reactive" anti-HBs (or HBsAg) test result indicates that a person is protected against the hepatitis B virus. This protection can be the result of receiving the hepatitis B vaccine or successfully recovering from a past hepatitis B infection. A positive anti-HBs (or HBsAg) test result means you are “immune” and protected against the hepatitis B virus and cannot be infected. You are not infected and cannot spread hepatitis B to others.

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