In the model the change from CCM1 to CCM2 was suggested on a population level. In reality, of course, there might not be a real threshold and the strategy might change depending on the individual resources of local health authorities. Of course with the change of the epidemiologic picture more rigorous measures of social distancing, such as school closures may be implemented. When leaving the intensive phase of contact tracing and case management (CCM1), we believe that CCM2, or a strategy with similar effect, might be well suited to follow after because it focuses on the household. This is a much more amenable unit and is based on the knowledge that being a member of a household with a confirmed case is the highest single risk factor for influenza infection [6] .