The infectious compartment of the model was subdivided into three groups based on clinical severity: asymptomatic, mild and severe infections. All asymptomatically and mildly infected patients were assumed to recover, while severe cases were at risk of death and were assumed to need antiviral treatment and hospitalized care, although whether they received either of these depended upon the availability of oseltamivir and hospital beds, respectively. Treatment with antivirals and hospitalization were assumed to reduce the infectious period and the probability of death for severe cases. Furthermore, a proportion of severe cases are assumed to require mechanical ventilation, which they will receive as long as ventilators are available, otherwise these cases would die.