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How COVID vaccines are being divvied up around the world
www.nature.com
An injection syringe of the COVID-19 vaccine developed by Pfizer and BioNTech, used for a trial in a hospital in Ankara, Turkey.Credit: Dogukan Keskinkilic/Anadolu Agency/Getty.
Contact-tracing apps help reduce COVID infections, data suggest
www.nature.com
Now, studies from a handful of nations show mounting evidence that apps can help prevent infections and are a valuable public-health tool.

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