https://techcrunch.com/2020/07/20/covid-19-vaccine-trials-from-the-university-of-oxford-and-wuhan-both-show-early-positive-results/

There are more promising signs from ongoing efforts to develop a vaccine that’s effective in preventing COVID-19: Two early trials, one from the University of Oxford, and one from a group of researchers in Wuhan funded in part by the National Key R&D Programme of China. Both early trials showed efficacy in increasing the presence of antibody responses to SARS-CoV-2, the virus that leads to COVID-19, and also indicated that these prospective vaccines were safe to administer based on available information.

The University of Oxford study is one of the leading vaccine development efforts in the world, and among those that are furthest along in development. The results of their study covered 1,077 participants, all of whom were health adults aged between 18 and 55 with no prior confirmed history of having contracted SARS-CoV-2. That’s important because they received double randomized trials of the vaccine candidate, or an existing vaccine for meningitis as a control acting as a placebo. The results showed that across the group, 100 percent of the participants had demonstrated neutralizing antibody responses by the end of the course, which include a booster does.