I found this on the CDC website:
Meningitis Vaccine for Adolescents
A meningitis vaccine called Menactra, which was approved by the FDA a year ago, is also recommended for:
* All 11- and 12-year-olds
* Adolescents entering high school who haven't already gotten the vaccine
* All college freshmen living in dorms (who have the additional option of getting a different meningitis vaccine)
* Other adolescents who choose to get the vaccine to reduce their risk
The CDC first announced its Menactra recommendations in May.
In October 2005, the FDA, the CDC, and Menactra's maker, Sanofi Pasteur, warned that five U.S. teens developed a serious neurological condition called Guillain-Barré syndrome after being vaccinated with Menactra.
At the time, a Sanofi Pasteur news release stated that there was no proof that Menactra was responsible for those teens developing Guillain-Barré syndrome.
At its October 20, 1999 meeting, the ACIP, citing results of two CDC studies done in 1998 which identified the slightly higher risk among freshman dormitory residents, recommended that those who provide medical care to this group give information to students and their parents about meningococcal disease and the benefits of vaccination. Vaccination should be provided or made easily available to those freshmen who wish to reduce their risk of disease. Other undergraduate students wishing to reduce their risk of meningococcal disease can also choose to be vaccinated.
A single dose of the vaccine is recommended, and vaccination will decrease the risk of disease caused by N. meningitidis serogroups A, C, Y, and W-135. However, vaccination will not totally eliminate risk of the disease because the vaccine does not protect against serogroup B and because, although it is highly effective against serogroups C and Y, it still does not confer 100% protection against these serogroups. In 1998-1999, serogroups C and Y caused about 70% of cases among college students.
for more detailed info, see:
http://www.cdc.gov/vaccines/vpd-vac/...-mening-fs.htm