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Researchers at Oxford University paused a trial of the coronavirus vaccine they are developing with AstraZeneca in children as young as 6 years old, pending a safety review by regulators in the United Kingdom.

Regulators in the U.K. and other countries using the vaccine have been investigating rare cases of brain blood clots and very low levels of platelets in people who have been vaccinated, to discern whether there is a connection. The trial was not paused because of any safety concerns in the trial, but to allow the review to finish.

Here are some significant developments:

  • More than 4 million people in the United States received a coronavirus vaccine on Saturday — the nation’s highest one-day total since the shots began rolling out in December — amid a rising caseload and increase in hospitalizations.
  • Texas will ban government-mandated “vaccine passports” that would require someone to show proof of coronavirus immunization to enter a space or receive a service, the second state to do so.
  • A record low number of Americans are worried about contracting the coronavirus, a new Gallup poll found — 35 percent, down 14 percentage points from February.
  • New Zealand said Tuesday it was launching a quarantine-free travel bubble with Australia later this month. Travelers would still be subject to restrictions, but the new program could help reunite families separated by the pandemic.
  • Montana Gov. Greg Gianforte (R) has tested positive for the coronavirus and will quarantine for 10 days, his office said Monday. His wife, Susan Gianforte, has exhibited no symptoms and is awaiting her test results, the office said.