What are the recommendations for a patient with no evidence of immunity to Hepatitis B infection, as indicated by a Hepatitis B surface antibody (HBsAb) level of less than 9, and a history of either past Hepatitis A infection or Hepatitis A vaccination, as evidenced by a positive Hepatitis A IgG (Immunoglobulin G) result?

Management of Patient with No Hepatitis B Immunity

This patient requires immediate initiation of a complete 3-dose hepatitis B vaccine series at 0,1, and 6 months, followed by anti-HBs testing 1-2 months after the final dose to confirm protective immunity. 1, 2

Immediate Action Required

• Administer the first dose of hepatitis B vaccine today without delay, even if concerns exist about series completion 1
• The standard vaccination schedule is 0,1, and 6 months 1, 2
• Do not postpone vaccination while conducting additional risk stratification or testing 2

Pre-Vaccination Considerations

Before proceeding with the vaccine series, consider testing for HBsAg to rule out chronic HBV infection, particularly if the patient has risk factors for HBV exposure (injection drug use, sexual exposure, healthcare work, or birth in endemic regions) 1, 2

Expected Response to Revaccination

• Most non-responders (44-100%) will develop protective antibody levels after receiving a complete second vaccination series 2
• The protective threshold is anti-HBs ≥10 mIU/mL 1
• Immunocompetent persons who achieve this level have long-term protection and do not need further periodic testing 1

Post-Vaccination Testing Protocol

Critical timing: Test anti-HBs levels exactly 1-2 months after the final (third) vaccine dose 1, 2

• Testing too early or too late will not accurately assess vaccine-induced immunity 1
• Schedule this follow-up appointment at the time of administering the final dose to ensure compliance 2
• Use a quantitative method that allows detection of the protective concentration (≥10 mIU/mL) 1

Management Based on Post-Revaccination Results

If anti-HBs ≥10 mIU/mL after the second series:

• The patient is considered immune 1
• No further vaccination or testing is needed for immunocompetent individuals 1

If anti-HBs <10 mIU/mL after the second complete series:

• Test for HBsAg and anti-HBc to rule out chronic infection 1
• If HBsAg-positive, refer for hepatitis B management 1
• If HBsAg-negative, the patient is a confirmed non-responder and should be counseled about precautions to prevent HBV infection 1
• Non-responders need hepatitis B immune globulin (HBIG) for any known exposure to HBsAg-positive sources 1

Special Considerations for High-Risk Patients

If this patient is a healthcare worker, public safety worker, hemodialysis patient, HIV-infected, immunocompromised, or a sexual partner of an HBsAg-positive person, postvaccination testing is mandatory to document immune status for future clinical management 1

Critical Pitfalls to Avoid

• Never restart the vaccine series if doses are delayed—simply continue from where you left off 2
• Do not accept verbal history of vaccination; only written, dated records constitute proof 1
• Do not test anti-HBs before completing all 3 doses of the vaccine series, as this cannot reliably predict final immune status 1
• Do not delay the first vaccine dose while waiting for additional testing results 1, 2

Documentation Requirements

• Maintain written documentation of all vaccine doses with dates 1, 2
• Record all serologic test results in the medical record 2
• Enter vaccine doses in the state immunization information system 1

Hepatitis A Status

The positive Hepatitis A IgG indicates immunity to hepatitis A (either from past infection or vaccination), which requires no further action 1