My husband and I are both fully vaccinated, and the Centers for Disease Control and Prevention says that we’re good to travel — with some modifications, of course.

But I am faced with a dilemma. Alaska, where we live, has been on the forefront of vaccinations. But until everyone we might encounter on a trip has been vaccinated, I am struggling with the idea of getting on a plane unless it’s absolutely necessary. On the other hand, I realize that tourism-reliant destinations badly need help right now.

How can I think reasonably about the following questions: Can I travel — and should I travel — if I know there’s some chance, however small, that it could endanger others? And if I do travel, how can I ensure I’m keeping other people as safe as possible? Jackie

With the news that vaccinated Americans may be able to travel to Europe this summer, the question of “We can, but should we?” is certain to be top of mind. And the decision fatigue is real, especially when you’re trying to weigh the public health and ethical elements of traveling.

“When the C.D.C. came out and said it’s OK to travel, that was based on a thoughtful review of the risk levels,” said Amber D’Souza, an epidemiology professor at the Johns Hopkins Bloomberg School of Public Health. “But the answer is not for everyone to hop on a plane; it is purely that people who are vaccinated can now consider whether to go on a plane in a way that they did not consider it before.”

Although private jets, hotel buyouts and vacation rentals offer the promise of hermetically sealed trips devoid of germs and strangers, most of us will encounter other people on vacation. And many of those people will be unvaccinated: There’s not a single state that has fully vaccinated a majority of its population yet, and there are plenty of countries around the world, from Spain to India, where infection rates are rising.

Vaccinated people are unlikely to become sick with Covid-19, but there is still a small chance they can become infected with the virus and potentially spread it to others. New data suggests these so-called “breakthrough infections” are rare, and that when vaccinated individuals do become infected, they are usually asymptomatic.

The likelihood of a vaccinated person becoming infected generally depends on two things, Dr. D’Souza said: “Whether you come in contact with an infected person, which is influenced by the infection rate wherever you are, and your own personal behavior in terms of distancing, masking and how many people you interact with.”

“Rates are rising right now in parts of the country,” she added, “and so when you’re vaccinated, your risk is lower, but it is not zero.”

So if a restaurant server, hotel clerk or airplane seatmate might be at risk or unvaccinated, what would ethics and public health experts say about the idea of you traveling?

Pamela Hieronymi, a philosophy