Flu in Mexico -- IF it did start in La Gloria, it could easily have spread to Mexico City

In a previous post, it was mentioned that finally Fidel Herrera Beltrán might be calling in some truly independent investigators to look into The Situation at Granja Carroll and La Gloria to see if it might be at all possible to track the flu there still.  Numerous questions mean that it is impossible to rule it out including the rather unusual outbreak which affected a quarter of the population in March and earlier of this year. Apparently half the working population of La Gloria works in Mexico City during the week, returning home on weekends.  (Many others have migrated to the states -- where in the States? When?)  Given that people can be contagious with the flu for days before they exhibit symptoms (if indeed they do exhibit notable symptoms), it seems quite possible that these workers may have brought the flu to the Mexico City.  Is this being investigated?