A 45-year-old man known to be HIV positive, presents with fever, cough, weight loss and confusion. Vitals are as follows : HR 105 BP 110/70 Sats 94% RA T 37.9°C BSL 5.4mmol/L

1. List (4) important differential diagnoses. 4 marks

2. List and justify (4) specific investigations that will help differentiate the cause. 4 marks

3. State (5) factors you will consider in your risk assessment for HIV transmission. 5 marks

4. State (5) key counselling points to discuss when prescribing PEP to the girlfriend. 5 marks