Change

Propability

$\Delta x^{\left(1\right)}{\left[-\mathrm{1,1}\right]}^{\text{T}}$

$\alpha SI/\left(S+I\right)\Delta t$

$\Delta x^{\left(2\right)}{\left[\mathrm{0,}-1\right]}^{\text{T}}$

$\beta I\Delta t$

$\Delta x^{\left(3\right)}{\left[\mathrm{1,}-1\right]}^{\text{T}}$

$\gamma I\Delta t$