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    He barely survived COVID-19. Now the Delta variant looms


    San Diego — Coronavirus played a nasty trick on David Arellano while he was sleeping.

    When doctors put him into a medically induced coma on April 13 due to a life-threatening case of COVID-19, the U.K. variant of the virus held sway. But by the time they started weaning him off of sedatives on May 23, the strain gaining dominance was a new version first identified in India called the Delta variant.

    This new variant, Arellano quickly learned, is mutated enough that the antibodies his body built to fend off his previous coronavirus infection don’t work so well against Delta.

    His immune system and the immune systems of all those who fought off the virus before Delta arrived, are aimed at the past, like bottles of medicine past their expiration dates.

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