COVID vaccine researchers turn to immunity boosters from a Chilean tree – KCRW

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Vaccines commonly contain adjuvants — substances that help fire up people’s immune systems. These adjuvants are sourced from obscure places like the soapbark tree, which only grows in Chile. The tree’s particular adjuvant is an important ingredient in one of the leading COVID-19 vaccines in the U.S. government’s Operation Warp Speed.

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