One of the yellow mobile minivans from the state Department of Public Health will be in Danbury today.  The van will be at the Harambee Center on West Street from noon to 6pm.  The vans were slated to administer the one-dose Johnson & Johnson shots, but now are stocked with Pfizer or Moderna.  Governor Lamont has compared them to an ice cream truck where people can walk up, get vaccinated and be on their way.  Another van will come back to Danbury three or four weeks later to administer the second dose to those who receive a shot today.