Sirs Model with Double Time Delay

Optimal control strategies to combat COVID-19 transmission: A mathematical model with incubation time delay

“…The importance of incorporating the delay parameter, which takes into account the extra days over the incubation period (2–14 days) for the symptoms to be visible, lies with the fact that this delay makes it very difficult to protect the susceptible class from the infected individuals or provide the necessary treatment at the initial stages. Although, a lot of researches have been conducted using delay parameters [36] , [63] , [64] , [65] , [66] , still the effect of this parameter on COVID-19 is not explored much. Therefore, we have attempted to study what effects incubation period can have on the spread of the disease by combining it with several control strategies.…”