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Photo: PATRICK T. FALLON (Getty Images) If you’re planning an international trip (or if you’re on one right now), it’s time to brush up on the COVID-related regulations, because testing requirements changed, and they take effect today . Also, remember how the Biden administration decided in early November that country-based travel bans are a bad idea ? They’re back. You now need a test one day before departure on your trip When traveling to (or returning to) the U.S., you’ll need a negative viral test. Until recently, vaccinated travelers could get this test three days before departure. That was handy for scheduling, and also gave you some extra time in case the place that handles your test takes time to get results back. But now, everybody is back to a one-day requirement, vaccinated or not. This is based on calendar days, so no matter what time your flight is on Tuesday, you can get your test anytime on Monday. You’re still recommended (but not required) to get a viral test three to five days after returning home, and to quarantine for seven days. The exceptions: children under 2 years old don’t need the test, and people who have recovered from COVID in the past 90 days can skip the test if they have medical records documenting their illness. These changes mean you’ll need to do a little more planning. If you’re traveling to another country, do you know where you can get a test before you board your flight […]