THE HOME STRETCHVaccines train the body to rapidly recognize and fend off an invading germ. About 15 experimental COVID-19 vaccines are in various stages of human studies worldwide.And while there’s no guarantee any will pan out, moving three different kinds into final testing offers better odds -- especially since scientists don’t yet know just how strong an immune reaction the shots must spark to protect.Measuring that with the first proven vaccine will “really help us understand for all the other vaccines in development, do they also have a chance?" said Oxford University lead researcher Sarah Gilbert.Only China is pushing out “inactivated" vaccines, made by growing the new coronavirus and killing it.
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