Final answer:
Adults with no travel history, college freshmen living in dormitories, and infants under the age of 6 have an increased risk of becoming infected with meningococcal meningitis.
Step-by-step explanation:
The meningococcal vaccine should be offered to high-risk populations, and the increased risk of becoming infected with meningococcal meningitis applies to the following groups:
- Adults with no travel history: Although the risk is lower compared to other groups, adults with no travel history are still at an increased risk of infection.
- College freshmen living in dormitories: Due to close contact and the potential for outbreaks in communal living spaces, college freshmen living in dormitories are at an increased risk.
- Infants under the age of 6: Infants have a higher risk of infection because they are more susceptible to diseases, including meningococcal meningitis.