[Etiology and clinical course of purulent meningitis and encephalitis in adults].

The authors, basing on the own experience in the treatment of 578 patients with purulent meningitis and encephalitis, discuss etiologic and clinical problems as an early diagnosis of the cause decides on the proper therapy and often on the patient's fate. The authors are convinced that the result of general CSF examination is a crucial diagnostic criterion in meningitis and encephalitis but does not permit identification of the disease causes. Problems with etiological verification is discussed. The authors have found that the infection with N. meningitidis and S. pneumoniae remains the most frequent cause of the disease in adults. However, the cause of the disease cannot be determined in over 50% of patients, and etiological verification of infections caused by H. influenzae and anaerobic organisms is quite unsatisfactory. The authors stress that over 20% of patients had skull injury and meningitis most frequently resulted from the infection with S. pneumoniae in these patients. It is suggested that purulent meningitis and encephalitis as a rule is endogenous disease produced by the activation of endogenous source of the infection.