A new study finds genetic variations in Covid patients that could point to better drug treatments.

A member of the U.S. military and an employee of the New Jersey Institute of Technology prepared doses of the Pfizer-BioNTech vaccine at an immunization site in Newark last month.
Credit…Bryan Anselm for The New York Times

The Delta variant of the coronavirus can evade antibodies that target certain parts of the virus, according to a new study published on Thursday in Nature. The findings provide an explanation for diminished effectiveness of the vaccines against Delta, compared with other variants.

The variant, first identified in India, is believed to be about 60 percent more contagious than Alpha, the version of the virus that thrashed Britain and much of Europe earlier this year, and perhaps twice as contagious as the original coronavirus. The Delta…

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