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You have been asked to see a 40-year-old male in A&E who has presented with shortness of breath and a fever. This patient’s observations are as follows: BP 121/84, HR 101, RR 31, O2 saturations 95% on room air and a temperature of 38.3. This patient has a past medical history of depression, anxiety, HIV and erectile dysfunction. What is the most common pathogen to cause this patient’s symptoms?