Final answer:
Meningitis is most prevalent among infants, adolescents, and young adults, especially in crowded settings like college dormitories. Outbreaks are also common in the 'meningitis belt' of sub-Saharan Africa. Vaccination has significantly reduced prevalence in many parts of the world.
Step-by-step explanation:
Meningitis is more prevalent in specific populations due to various factors. Infants, adolescents, and young adults have the highest prevalence, especially those in close quarters such as college dormitories, military barracks, and similar settings. For example, from 2011 to 2015, there were at least nine meningococcal outbreaks on college campuses in the United States. Outbreaks can also occur in other crowded environments like schools and prisons.
In sub-Saharan Africa, an area known as the meningitis belt sees a higher prevalence of meningococcal meningitis, influenced by factors like climate and living conditions. Vaccination against the disease is crucial, particularly for those living in or traveling to high-risk areas.
While bacterial meningitis is more severe, viral meningitis still poses a risk. Notably, Haemophilus influenzae Type b meningitis rates have significantly decreased in countries with widespread vaccination programs.