<prompt> Most common serotype causing meningococcus epidemics isAW - 135CY  <response>: Meningococal Meningitis Causative agent : N.meningitidis,a gran negative diplococci Serotypes A, B, C, D, 29E,W135,X,Y World wide Group A is the MC cause of Meningococcal Epidemics except in America, especially in Sub saharan African belt Recently Group B, W-135, Y cases have staed increasing in World Epidemics caused by : A, C B W-135, Y Ref: Park 23rd edition Pgno : 166 