Those are usually given to the people who are most at risk--like young children, people with weak immune systems,  or people who gather in large groups where an outbreak of meningitis  could potentially happen.
Usualmente se aplican a poblaciones de riesgo, como niños, personas con un sistema inmunitario debilitado, o personas que se reúnen en grandes multitudes, en las que un brote de meningitis es más probable.