CRP and bacterial meningitis: Binary logistic regression on our patient collective identified six criteria to significantly differentiate between bacterial meningitis and other causes of CSF pleocytosis: CSF cell count > 100/μl (C), high CRP > 5 mg/dl (H), altered mental status (A), nuchal rigidity (N), CSF protein > 100 mg/dl (C) and elevated WBC count (E).