Viral is the most common, but other types are more dangerous Medically reviewed by Brigid Dwyer, MD Meningitis is ...

This fluid can also help your doctor determine whether bacteria, viruses, or other infectious agents are causing the meningitis. Lumbar puncture is the only definitive way to diagnose meningitis.

Performing a lumbar puncture on neonates with possible neonatal sepsis, meningitis, or both is the key to successful outcomes for these infants, according to the results of an Italian study.