A Link Between Spring Break & Swine Flu?

This morning, New York City Health Commissioner Thomas Friedan spoke of an interesting theory.  He was giving a daily update on the number of New Yorkers who are now confirmed to have the H1N1 flu.  Of the 49 cases in New York, 47 of them are associated with St. Francis Prep high school, a very large parochial school in the city.  Why this school and not others?  We know that students from the school traveled to Mexico on their spring break.  But Mexico is a destination for lots of New York City students on break.  It turns out that the St. Francis break comes one week after the New York City public schools.  Perhaps, said Friedan, the later break may have placed the St. Francis students in Mexico during a more contagious time period, more contagious than the week before.  Again, its just a theory.