A 53 year old
female presents with fever. There is no past history of note and she is not on
examination you note that she is confused and that there is neck stiffness and
Kernig’s sign is positive.
puncture is performed and the CSF shows
Cells 85 /mL-1
mmol/L (blood glucose 6.2 mmol/L)
patient which one of the following would be the most likely causative