If a worker is exposed to HBV and their vaccine response is unknown, which is the correct initial post-exposure action?

If a worker is exposed to HBV and their vaccine response is unknown, which is the correct initial post-exposure action?

• A. Baseline testing for HBV antibodies
• B. Immediate HBV vaccination booster
• C. Post-exposure prophylaxis with hepatitis B immune globulin only
• D. No testing is needed

Answer: (A)

After exposure to hepatitis B, the first step is to determine the worker’s immune status by obtaining baseline HBV serologies, specifically anti-HBs to see if protective antibodies are present and HBsAg to assess current infection. This information guides what prophylaxis, if any, is needed. If anti-HBs is 10 mIU/mL or higher, the worker is considered protected and only routine follow-up is needed. If anti-HBs is below 10 or unknown, the worker is susceptible, and post-exposure prophylaxis should be started with both hepatitis B immune globulin (HBIG) and the hepatitis B vaccine series as soon as possible, ideally within seven days of exposure. Testing first ensures appropriate, targeted protection rather than guessing or delaying care.

After exposure to hepatitis B, the first step is to determine the worker’s immune status by obtaining baseline HBV serologies, specifically anti-HBs to see if protective antibodies are present and HBsAg to assess current infection. This information guides what prophylaxis, if any, is needed. If anti-HBs is 10 mIU/mL or higher, the worker is considered protected and only routine follow-up is needed. If anti-HBs is below 10 or unknown, the worker is susceptible, and post-exposure prophylaxis should be started with both hepatitis B immune globulin (HBIG) and the hepatitis B vaccine series as soon as possible, ideally within seven days of exposure. Testing first ensures appropriate, targeted protection rather than guessing or delaying care.