Of the two types of that affect the spinal column and the fluid around it, the bacterial type is often more serious. meningitis pneumonia influenza streptococcus

Acute bacterial meningitis is one of the two types of meningitis that affect the spinal column and the fluid around it, the bacterial type is often more serious.
Meningitis is either caused by viruses or bacteria. The type of meningitis caused by viruses is often serious, however, less severe than the meningitis caused by bacteria. 

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