The most common cause of meningitis in adults is:

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While all of these organisms can potentially cause meningitis, Streptococcus pneumoniae is currently the most common cause of meningitis in adults, especially in countries that have implemented vaccination programs against Neisseria meningitidis and Haemophilus influenzae type B. Listeria monocytogenes is also a common cause of meningitis in immunocompromised adults, pregnant women, and elderly individuals.

The Most Common Cause of Meningitis in Adults Is