WHYY By After receiving the vaccination, patients wait under observation at the mass vaccine clinic at the Pennsylvania Convention Center. (Kimberly Paynter/WHYY) Updated at 7:07 p.m. Philadelphia Health Commissioner Thomas Farley expressed regret about trusting thousands of vaccine doses to now-disgraced start-up Philly Fighting COVID — adding he assumed established health systems would be too busy for the task. Officials confirmed they’d received at least seven applications for its community vaccination request for proposals, including from major health systems Penn Medicine, Einstein, and Temple Health. The end-of-year approvals of the Pfizer and Moderna vaccines were widely anticipated for months before the FDA emergency use authorization and shipment began. Asked why the city hadn’t used this time to set up a vaccine-distribution system with big medical players, Farley responded he assumed they’d be too busy.