Delta surge: WHO is launching the Rapid ACT-Accelerator Delta Response - RADAR Delta surge: WHO is launching the Rapid ACT-Accelerator Delta Response - RADAR July 30, 2021 Share To: In response to the Delta surge, today the Access to COVID-19 Tools Accelerator is launching the Rapid ACT-Accelerator Delta Response, or RADAR, issuing an urgent call for 7.7 billion U.S. dollars for tests, treatments and vaccines. Share