WHY is the Obama administration urging schools to stay open once the swine flu spreads like wildfire?

Notwithstanding the shortage of vaccine, the fact that it will not be ready until mid October, and the every increasing number of cases of H1N1 being reported in schools, the Obama Administation is urging all schools to remain open no matter what and to establish quarantine areas within schools. Why are they doing this when they know that in past servere flu epidemics health officials have advocated closing schools for a few days or a week in order to halt the spread of the flu?