Healthcare Oxford University COVID-19 vaccine hopes rise with strong trial results Updated : July 16, 2020 06:09 PM IST The discovery is promising because separate studies have suggested that antibodies may fade away within months while T-cells can stay in circulation for years. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.