To estimate the effect of various interventions on the spread of pandemic influenza, the effect of specific interventions on transmission rates needs to be quantified. Generally, estimates of the proportion of infections that occur in the various social contexts such as households, schools, workplaces, and communities have been reported. Then, estimates of relative effect of intervention measures on transmission in each context will need to be established. It would also be useful to know how implementation of a particular measure might disrupt contact patterns in other social contexts. For example, we would like to know the extent to which household and community contacts are increased when schools are closed.