British researchers testing an experimental vaccine against the new coronavirus are moving into advanced studies and aim to immunize more than 10,000 people to determine if the shot works.
Last month, scientists at Oxford University began immunizing more than 1,000 volunteers with their vaccine candidate in a preliminary trial designed to test the shot's safety. On Friday, the scientists announced they now aim to vaccinate 10,260 people across Britain, including older people and children.
About a dozen different experimental vaccines are in early stages of human testing or poised to start, mostly in China, the U.S. and Europe, with dozens more in earlier stages of development. Most of the vaccines in the pipeline aim to train the immune system to recognize the spiky protein that studs the new coronavirus' outer surface, so it's primed to attack if the real infection comes along. The Oxford vaccine uses a harmless virus -- a chimpanzee cold virus, engineered so it can't spread -- to carry the spike protein into the body. A Chinese company created a similar shot.
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