You have just performed a Lumbar Puncture on a 45 year old man with a 2 day history of a headache. Here is an image of the samples you collected:

Lumbar puncture

1. What is the likely diagnosis? 1 mark

2. Complete the table of suggestive CSF findings for each differential (bacterial meningitis, viral meningitis, SAH). A range can be provided where appropriate. 6 marks

3. Describe a clinical grading system for this condition. State (5) points in your answer. 5 marks