Oxford Covid-19 immunization: Serum Institute starts phase 3 of clinical preliminary Kumar Jeetendra | September 21, 2020 The phase-III or the last stage of clinical trial of the Covid-19 vaccine’Covishield’, being developed by Oxford University, also fabricated by the Serum Institute of India (SII), began today at the state-run Sassoon General Hospital in Pune, Maharashtra on Monday, a senior official said. “We have begun the phase-III trials of the vaccine candidate. We’ll …