Viral mengititis is caused by ENTEROVIRUS
and is not that contagious.
There ar two ways by which this virus be transmitted.
1st by the respirspatory secretions
2nd by contaminated fecal matter.
Although it is quite likely that you may get the virus from somebody who is infected with this disease,but it would be rare for you to get sick.
Prevention is by...
By avoiding handshakes and doing repeated hand washing in the day.
If you get really very close to the patient,then you may boil your clothes and can then bleach in mild chlorine.
There is no vaccine
for viral meningitis