Acting Connecticut Health Commissioner Diedre Gifford said Monday the number of people working on the state’s vaccination sign-up phone service has been doubled. There have been complaints about seniors who are now eligible for the vaccine having difficulties with the sign-up process. Gifford spoke at Rentschler Field in East Hartford, where officials gathered to celebrate the first week of operation for the mass vaccination site. The unused Pratt & Whitney Runway can accommodate more than 1,000 cars a day. Gov. Ned Lamont called the lines of vehicles there “lines of hope.”