Final answer:
Neisseria meningitidis is the organism that typically causes the greatest number of community-acquired cases of meningitis.
Step-by-step explanation:
The organism that typically causes the greatest number of community-acquired cases of meningitis is Neisseria meningitidis. It is one of the most common causes of bacterial meningitis and is spread from person to person through respiratory secretions. Meningococcal meningitis, caused by Neisseria meningitidis, is especially prevalent among infants, adolescents, and young adults.