Class-Age Structure for Epidemics

Such an impressive description of the onset of the plague symptoms does not apply to all diseases, and yet the moment when an infected becomes aware of his status is never easy, even for a simple cold. However, the appearance of the disease symptoms is one of the last steps in its progression and the “disease clock”, activated within an individual at the moment of the infection, may run for a long time, thus determining different effects on the transmission mechanism.