Before revision:  In the present workwe study a modified SEIRS model with population migration between two cities: a fraction of population in each city is allowed to migrate. Possible infection during transit is also incorporated - a fraction of exposed population becomes infected during transit .
After revision:  In this work, we present the population migration model for n-cities and apply the model for migration between two and three cities. The reproduction number is calculated and the effect of the migration rate is being analyzed .