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Why the mutated coronavirus variants are so worrisome Jason Gale, Bloomberg FacebookTwitterEmail Discarded syringes in a biohazard waste container at the Lux Med oncology hospital in Warszawa, Poland, on Feb. 25, 2021.Bloomberg photo by Lukasz Sokol. Viruses mutate all the time, including the coronavirus that s caused the global covid-19 pandemic. Although most of the changes are innocuous, several mutants have sparked alarm, and three variants that emerged in the U.K., South Africa and Brazil have caused particular concern. Studies suggest they are more contagious, and some evidence points to one of them being more deadly, and another driving reinfections. Vaccine developers are working on new versions after early data from South Africa indicated AstraZeneca s inoculation was less effective against the variant circulating there.

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