I’m a U.S. Citizen. Where in the World Can I Go?

 For Americans eager to resume international travel, here are the countries that currently allow U.S. citizens to enter, though there may be restrictions, including vaccine requirements.

Spot a country requirement that has changed? Email us at travelrules@nytimes.com.

Most of the world’s countries are open to travelers from the United States, but as variants — including the new Omicron variant — cause coronavirus cases to rise, some places have resumed restrictions like pre-arrival testing, quarantine and even travel bans. Most recently, some countries, including Israel and Morocco, announced that they closed their borders to foreign travelers for at least 14 days in an effort to contain the spread of the Omnicron variant.

Most European countries allow vaccinated Americans, but member countries are free to impose their own restrictions. Some, including Germany, Austria and the Netherlands, have recently experienced an upswing in cases, and visitors there are likely to notice more cautionary measures. The Netherlands, for example, introduced a partial lockdown recently, resulting in restaurants, bars and other establishments closing early.

In contrast, India and Cambodia are now allowing fully vaccinated U.S. travelers to enter without having to quarantine.

The Centers for Disease Control and Prevention, meanwhile, continues advising Americans not to travel internationally until they are fully inoculated against Covid-19. Even then, the C.D.C. is cautioning travelers to “pay close attention to the situation at your international destination before traveling outside the United States.”