The Oxford coronavirus vaccine trial, being carried out with British pharmaceutical firm AstraZeneca, has seen a "robust" immune response in older and younger adults, according to partial test results published in The Lancet. The study also shows the vaccine is safe, with only mild side effects experienced by participants in the trial. Full results on the effectiveness of the Oxford vaccine are still to be published, but rivals Pfizer and Moderna have said their vaccines are around 95 percent effective in protecting against Covid-19.
