Meet the 4 frontrunners in the COVID-19 vaccine race

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Researchers have now reported data from early (and small) clinical trials of four candidate COVID-19 vaccines.

So far, the data is positive. The vaccines appear to be generally safe, and they spur immune responses against the novel coronavirus, SARS-CoV-2. But whether these immune responses are enough to protect people from infection and disease remains an important unknown.

The four candidates are now headed to larger trials-phase III trials-that will put them to the ultimate test: can they protect people from COVID-19 and end this pandemic?

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