Epidemic is due to
serotype “A” meningocooci.For chemoprophylaxis, we used silphadiazine,100mg/kg
body weight /per day in two divided doses for four days in children and 1 gm
12th hourly for 4 days in adult. Unfortunately the protection
offered disappeared immediately after the drugs are discontinued. Prolonged
use is forbidden due to their side effects
Rifampicin is not advocated then.