If we look at a bigger sample, like say a decilitre, then around 70% of those will be lymphocytes, 30% monocytes, and just a few polymorphonuclear cells -- PMNs -- like neutrophils.
The immune reaction also causes the glucose concentration in the CSF to fall, to below two thirds of the concentration in the blood, and makes the protein levels increase to over 50 mg per decilitre.