Stochastic and monte carlo simulation for the spread of The hepatitis B . Threshold and stability results for an sirs epidemic model with a general periodic vaccination strategy The effect of using different types of periodic contact rate on the behaviour of infectious diseases: A simulation study Threshold and stability results for an SIRS epidemic model with a general periodic vaccination strategy. Use of a Periodic Vaccination Strategy to Control the Spread of Epidemics with Seasonally Varying Contact Rate. Seasonally Varying Epidemics With and Without Latent Period: A comparative Simulation Study. The Effect of Using Different Types of The Periodic Contact Rate on The Behavior of Infectious Diseases: A simulation Study. Modelling the hepatitis C with different types of virus genome. Stochastic Model for the spread of the Hepatitis C Virus with different types of virus genome. Stochastic Model for the spread of the Hepatitis B Virus. Different Vaccination Strategies for Measles Diseases: A Simulation Study. Efficiency of different vaccination strategies for childhood diseases: A simulation study. Modelling and Simulation of the Spread of HBV Disease with Infectious Latent. An SEIR Model with Infectious Latent and a Periodic Vaccination Strategy