You are working night shifts on A&E/MAU in a rural DGH. A 29-year-old man presents via A&E with a three-week history of cough and fatigue. On examination you note significant pallor and a petechial rash. His tonsils are enlarged and inflamed and he has poor dentition. Baseline obs show that he has a fever of 39 c and is slightly tachycardic (HR118, BP 100/40, sats 93%, RR 18). A full blood count is phoned through to the department and shows:

• Hb 69 g/l
• Plts 33
• WCC 14

Please answer the following question:

What is the possible differential diagnosis?

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