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The unusually contagious delta coronavirus variant, first found in India, could become the dominant strain in the United States this summer, Centers for Disease Control and Prevention director Rochelle Walensky said Friday.

“It is more transmissible than the alpha variant, or the U.K. variant that we have here,” Walensky said in an interview with ABC’s “Good Morning America” on Friday. “We saw that quickly become the dominant strain in a period of one or two months, and I anticipate that is going to be what happens with the delta strain here.”

Repeating calls for people to get vaccinated, Walensky said she fears that a new strain could prove resistant to vaccines but emphasized that full vaccination protects against the delta variant.

“As worrisome as this delta strain is with regard to its hyper-transmissibility, our vaccines work,” she said.

Here are some significant developments:

  • A federal judge said the CDC can’t enforce its rules for coronavirus-era sailing against cruise ships in Florida starting July 18, a decision hailed by Florida’s governor as a “major victory.”
  • The European Union formally recommended Friday that its member nations gradually open borders to nonessential U.S. travelers, while giving them leeway to set their own restrictions.
  • Canada announced Friday that it will extend its restrictions on nonessential travel at the U.S.-Canada border until July 21, even as vaccination rates in the country have climbed and infections have waned.
  • Italy announced Friday that it will impose a new five-day quarantine for British travelers, citing the delta variant as a concern.
  • A “significant” outbreak of the coronavirus at the U.S. Embassy in Kabul has prompted a lockdown for its staff members.