A 30-year-old healthcare worker sustains a needlestick injury from a known hepatitis B positive source. He completed the vaccination course but has unknown antibody levels. According to UK guidelines, what is recommended immediately?ANo action neededBHepatitis B booster dose plus hepatitis B immunoglobulinCImmediate start of antiviral therapyDHepatitis B immunoglobulin aloneETest the source patient's HBV statusCheck my answer