| Federal health officials gave the green light Friday for fully vaccinated people to resume travel as an estimated 100 million Americans have had at least one dose of coronavirus vaccine, and evidence mounts of the shots' effectiveness. The Centers for Disease Control and Prevention updated its guidance because of several newly released studies documenting the strong real-world effectiveness of coronavirus vaccines in protecting against infection and spread of the virus, and the rapid pace of vaccinations, now close to 3 million people a day. Until Friday's announcement, officials were still discouraging people who had been fully vaccinated from traveling. | 
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