Initial vaccine tests focus on safety, and researchers in both countries are trying out different doses of different types of shots. Second phase allows vaccines to be tested to look for signs that they protect against infection.
With a careful jab in a healthy volunteer’s arm, scientists at the Kaiser Permanente Washington Research Institute in Seattle begin an anxiously awaited first-stage study of a potential Covid-19 vaccine developed in record time.
Researchers say they traced the DNA of a jawbone found in a cave on the Tibetan Plateau to the Denisovans, a defunct cousin of modern humans.
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