Is an STI causing this man's jaundice?

A man presents with fatigue and nausea. He is a non-injecting drug user and has regular condomless anal intercourse

Hamish, a 33-year-old web designer, presents complaining of several days of fatigue and nausea. Today he has developed yellow eyes and pruritis.

Blood test nervous

Hamish attends regularly for pre-exposure prophylaxis (PrEP) for HIV, including three-monthly sexual health checks.

Before starting PrEP, hepatitis B virus immunity was confirmed and hepatitis A virus vaccination completed.  

He is sexually active with casual male partners, mostly other PrEP-users. He usually engages in condomless anal intercourse, both