Bacterial
http://www.med.umich.edu/1libr/pa/pa_dbacmeni_pep.htm
seems like you need those meds for more than 3 days
http://www.mehtachildcare.com/diseases/meningitis.htm
The child must be hospitalised. Meningitis is a serious illness that needs intensive care, and home treatment should not be asked for. The diagnosis of meningitis is first confirmed by blood tests and a special test called a lumbar puncture (spinal tap). If meningitis is suspected, however, antibiotics in high doses are started immediately, without waiting for the results of the tests. A few hours can make a huge difference in the outcome of this life-threatening illness.
If the child is unconscious, admission to an intensive care unit is important. Intravenous fluids, glucose, drugs to control seizures, and other supportive treatment are given, in addition to the intravenous antibiotics. Children with difficulty in breathing may need oxygen inhalation, or help in breathing by a machine called a ventilator.
The antibiotics are usually given for 10-14 days, but a longer duration is needed in newborn babies, and children with poor immunity. The entire course must be given intravenously; there is no place for oral or intramuscular antibiotics in meningitis.