Does the CDC recommend booster injections for people who received the HBV vaccine and who have had a positive serologic test for the protective antibody, anti-HBs?

Currently, a booster inoculation is not recommended. The key is to get tested within a few months after the third vaccine injection to make sure you have responded and produced sufficient levels of protective antibody. Later should you have subsequent serologic tests, even if the level of protective anti-HBs declines, immunological memory has been shown to last well over 25 years. The CDC continues to examine early test vaccine groups for possible cases of hepatitis B, and at this writing they have not found such infections.