International jetsetters have become accustomed to getting tested for Covid-19 at different points along their journeys. For vaccinated Americans, the most worrisome Covid-19 test is often the one that will determine whether they can come home.
Since January, all travelers must test negative for Covid-19 within 72 hours of entering the U.S. There are many reports in recent months of both vaccinated and unvaccinated travelers testing positive within the last three days of their trip.
This can completely upend re-entry plans because a positive test result means delaying a return to the U.S.. Travelers must get retested until they receive a negative test result and, in the meantime,
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