Oxford COVID-19 Vaccine Developer Cautious on 2020 Roll-Out

A woman holds a small bottle labeled with a "Vaccine COVID-19" sticker and a medical syringe in this illustration taken on April 10, 2020. Dado Ruvic/Illustration/Reuters

LONDON—The University of Oxford’s possible COVID-19 vaccine could be rolled out by the end of the year but there is no certainty, the lead developer of the vaccine said on Tuesday.

The experimental vaccine, which has been licensed to AstraZeneca, produced an immune response in early-stage clinical trials, data showed on Monday, preserving hopes it could be in use by the end of 2020.