Previously, it was reported that increased CSF ADA level can be caused by other diseases such as sarcoid meningitis, meningeal involvement with leukemia or lymphoma, cerebral toxoplasmosis, cerebral infarction, neurosyphilis, listeria meningitis, and other aseptic meningitis (Nishida et al. 2007). The gene discussed is ADA; the disease is aseptic meningitis.