
Notation  Parameter description  Range  Source 

 Natural death rate equally birth rate   [4] 
 The failure immunization  01  [23] 
 The rate at which the latent individuals become infectious   [3] 
 The rate at which the individuals move to the carrier class   [3] 
 The rate of flow from carrier to the vaccinated class   Assumed 
 The transmission coefficient   [24] 
 The proportion of individuals become carrier   [23] 
 Represent the loss of immunity  0.06–0.03  [13] 
 Represent the vaccination of susceptible   Assumed 
 The rate of flow from Migrated class to exposed class   Assumed 
 The rate of flow from Migrated class to acute class   Assumed 
 Unimmunized children born to carrier mothers   [13] 
 The infectiousness of carriers related to acute infection  01  [10] 
