Influenza is a common infectious disease that affects many people. Most people with influenza recover quickly, but elderly people and those with chronic medical conditions are at higher risk of complications and even death. Influenza vaccination rate refers to the number of people aged 65 and...

A general stochastic epidemic, with immigration, in a large population is examined, introducing exponentially distributed latent and incubation periods. By means of semigroups, existence and uniqueness are proved for the solution of the initial-value problem arising from the stochastic model...