Here's why shark researchers are concerned about a potential COVID-19 vaccine

MIAMI — Science’s steady march to find a vaccine capable of ending the coronavirus pandemic may come at the expense of another species: sharks.Miami shark researchers say they’re concerned about a key ingredient used to make vaccines more effective, squalene — an oily substance found in plants and even human skin — but is particularly concentrated in shark livers.The practice of using shark-derived squalene as a booster to stimulate a stronger immune response to a vaccine is not unique to the coronavirus vaccine. The compound has been shown to be safe and effective in millions of doses of vacc...

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