What is Transmission coefficient (epidemiology)?

The transmission coefficient is needed for models of Transmission where for instance a vector carries a pathogen or parasite between hosts. It is represented by β and it is the rate at which a pathogen moves from infected individuals to susceptible individuals in the population. It must be between 0 and 1.The transmission coefficient is used in the equation: : d Y d t = β X Y N − γ Y {\displaystyle {\frac {dY}{dt}}={\frac {\beta XY}{N}}-\gamma Y}