An experimental coronavirus vaccine developed by Johnson & Johnson protected monkeys from infection in a new study. It is the second vaccine candidate to show promising results in monkeys this week. The company recently began a clinical trial in Europe and the United States to test its vaccine in people. It is one of more than 30 human trials for coronavirus vaccines underway across the world. But until these trials are complete – which will probably take several months – the monkey data offers the best clues to whether the vaccines will work. Unlike other vaccines in development that require two injections, the J&J candidate shielded the monkeys with just one dose. The study is published in this week’s NatureLearn More