Successful travel starts with being prepared for the unexpected. Coronavirus disease 2019, known as COVID-19, is now a part of standard travel planning.

As you choose a destination, travel group or event, add COVID-19 to the list of things to research. When packing for yourself or anyone you're caring for on the trip, consider COVID-19 prevention and testing.

No one wants to plan for the worst. But having a plan in case you catch the COVID-19 virus while traveling can save time if you need medical care.

To start, it can help to ask these basic questions as you make plans.

Staying up to date on your COVID-19 vaccine helps prevent serious illness, the need for hospital care and death due to COVID-19.

If you need a vaccine, plan to get it at least a few weeks before you travel. Protection from the vaccine isn't immediate.

Many people with COVID-19 have no symptoms or mild illness. But for older adults and people of any age with certain medical conditions, COVID-19 can lead to the need for care in the hospital or death.

If you or those around you are at high risk of serious COVID-19 illness, take extra safety measures during or after travel.

Ask a healthcare professional if there are any specific actions you should take.

The country you travel to may not need to know your COVID-19 status. But you might need the information for other reasons.

Events, venues or tour groups might require proof that you are COVID-19 negative or are up to date on a COVID-19 vaccine. Check before you go so you have all the paperwork you need.

No one wants to get sick while traveling. But in case you do, it helps to know where you can get medical care and whether you'll be able to stay apart from others while you have symptoms.

Put together a COVID-19 kit with rapid home tests, masks, a thermometer, disinfectant wipes and hand sanitizer that contains at least 60% alcohol.

Before you leave, gather health information from your healthcare professional. Make sure it gives the details on any health conditions you're managing and medicine you take.

The virus that causes COVID-19 spreads mainly from person to person. When the virus is spreading, spending time indoors with a crowd of people raises your risk of catching it. The risk is higher if the indoor space has poor airflow.

The coronavirus is carried by a person's breath.

The virus spreads when a person with COVID-19 breathes, coughs, sneezes, sings or talks. The droplets or particles the infected person breathes out could possibly be breathed in by other people if they are close together or in areas with low airflow.

The virus carried by a person's breath can land directly on the face of a nearby person, after a sneeze or cough, for example. And people may touch a surface that has respiratory droplets and then touch their faces with hands that have the coronavirus on them.

While you travel, one way to lower your risk of COVID-19 is to clean your hands often.

Wash your hands after using the bathroom, before making food or eating, and after coughing, sneezing or blowing your nose. If you touch something that others regularly touch, such as an elevator button or a handrail, make sure to clean your hands afterward.

Also, try to avoid touching your eyes, nose or mouth.

Wearing a face mask is another way to lower your risk of COVID-19.

Travel brings people together from areas where viruses may be spreading at higher levels. Masks can help slow the spread of respiratory viruses in general, including the COVID-19 virus.

Masks help the most in places with low airflow and where you are in close contact with other people. Also, masks can help if viruses are spreading at high levels in the places you travel to or through.

Masking is especially important if you or a companion have a high risk of serious COVID-19 illness. Choose the most protective mask that fits well and is comfortable.

As the virus that causes COVID-19 changes, COVID-19 vaccines are updated, so stay up to date with the recommended shots.

Check with health agencies in the area to see where the COVID-19 virus is spreading. Information about the spread of the virus may include the number of people in the hospital with COVID-19 or the number of people who test positive for the disease.

Choose outdoor activities and keep some distance between yourself and others. Poor airflow plus lots of people crowded together equals a higher chance you'll come in contact with the virus that causes COVID-19.

If you can, try to avoid spending time with people who have COVID-19 symptoms or who are sick.

There will likely be times during travel when you don't have a choice about how close you are to others. Here are some tips for air travel, public transportation and lodging.

The risk of catching the virus that causes COVID-19 from air travel is thought to be low.

Air in the plane's cabin changes over quickly during the flight, being replaced every few minutes in some planes. Airplane air also is often filtered. So germs, including viruses, are trapped before they spread.

The air flowing down from vents above the seats in each row may help keep germs from spreading. Seats also may act as a barrier to germ spread on a plane, unless the person who is ill is sitting close to you.

You can help lower your risk by spreading out to keep distance between you and others when you can and cleaning your hands regularly.

Wearing a mask in crowded areas, such as security lines and bathrooms, can help protect you from COVID-19 and other respiratory illnesses.

Trains and buses may have good airflow and air filtering. But check before you travel so you know what to expect. When a vehicle is crowded, wear a face mask and take other steps, such as cleaning your hands.

Taxis and private cars used for ride-sharing may not have air filtering. But in most cases, rolling down a window could be an option to improve airflow.

Rental car companies may post their cleaning policies on the internet, or you can ask directly when you book the vehicle.

Cleaning protocols at hotels, vacation rentals and other lodging have largely returned to the way they were before the COVID-19 pandemic. If you have questions about how hosts or businesses protect guests, contact them directly. In public areas of hotels, take steps to lower your risk of catching the virus that causes COVID-19.

Despite your planning, an illness may delay or cancel your trip. Stay home if you or anyone you're traveling with has:

• Symptoms of COVID-19, such as fever or new loss of taste or smell.
• Taken a COVID-19 test and is waiting for results.
• Been diagnosed with COVID-19.

Keep watch for serious symptoms of COVID-19, such as trouble breathing or chest pain. If you or a person you're taking care of has symptoms that worry you, get help.

Once the fever is gone and symptoms are getting better, you may choose to travel. But for about five days after feeling better, you could still give others the virus that causes COVID-19. Take extra actions to protect the people around you.

• Wear a mask.
• Keep your distance from others, especially when indoors.
• Clean your hands regularly.
• Keep the air flowing by turning on fans or opening windows when you can.

If you start to feel worse or your fever comes back, avoid being around others again until you feel better.

With COVID-19 vaccinations, testing and treatment, events and travel are back to typical levels in many places. But as waves of COVID-19 outbreaks happen, it's important to stay flexible with your plans. Knowing whether the COVID-19 virus is spreading in your area or in places where you're traveling can help you make decisions about whether to go and what to put on your agenda.

As you think about making travel plans, consider these questions:

• Have you been vaccinated against COVID-19? If you haven't, get vaccinated. If the vaccine requires two doses, wait two weeks after getting your second vaccine dose to travel. If the vaccine requires one dose, wait two weeks after getting the vaccine to travel. It takes time for your body to build protection after any vaccination.
• Have you had any booster doses? Having all recommended COVID-19 vaccine doses, including boosters, increases your protection from serious illness.
• Are you at increased risk for severe illness? Anyone can get COVID-19. But older adults and people of any age with certain medical conditions are at increased risk for severe illness from COVID-19.
• Do you live with someone who's at increased risk for severe illness? If you get infected while traveling, you can spread the COVID-19 virus to the people you live with when you return, even if you don't have symptoms.
• Does your home or destination have requirements or restrictions for travelers? Even if you've had all recommended vaccine doses, you must follow local, state and federal testing and travel rules.

Some state, local and territorial governments have requirements, such as requiring people to wear masks, get tested, be vaccinated or stay isolated for a period of time after arrival. Before you go, check for requirements at your destination and anywhere you might stop along the way.

Keep in mind these can change often and quickly depending on local conditions. It's also important to understand that the COVID-19 situation, such as the level of spread and presence of variants, varies in each country. Check back for updates as your trip gets closer.

For vaccinated people

If you have been fully vaccinated, the CDC states that you don't need to get tested before or after your trip within the U.S. or stay home (quarantine) after you return.

If you're planning to travel internationally outside the U.S., the CDC states you don't need to get tested before your trip unless it's required at your destination. Before arriving to the U.S., you need a negative test within the last day before your arrival or a record of recovery from COVID-19 in the last three months.

After you arrive in the U.S., the CDC recommends getting tested with a viral test 3 to 5 days after your trip. If you're traveling to the U.S. and you aren't a citizen, you need to be fully vaccinated and have proof of vaccination.

You don't need to quarantine when you arrive in the U.S. But check for any symptoms. Stay at home if you develop symptoms.

For unvaccinated people

Testing before and after travel can lower the risk of spreading the virus that causes COVID-19. If you haven't been vaccinated, the CDC recommends getting a viral test within three days before your trip. Delay travel if you're waiting for test results. Keep a copy of your results with you when you travel.

Repeat the test 3 to 5 days after your trip. Stay home for five days after travel.

If at any point you test positive for the virus that causes COVID-19, stay home. Stay at home and away from others if you develop symptoms. Follow public health recommendations.

In the U.S., you must wear a face mask on planes, buses, trains and other forms of public transportation. The mask must fit snugly and cover both your mouth and nose.

Follow these steps to protect yourself and others when you travel:

• Get vaccinated.
• Keep distance between yourself and others (within about 6 feet, or 2 meters) when you're in indoor public spaces if you're not fully vaccinated. This is especially important if you have a higher risk of serious illness.
• Avoid contact with anyone who is sick or has symptoms.
• Avoid crowds and indoor places that have poor air flow (ventilation).
• Don't touch frequently touched surfaces, such as handrails, elevator buttons and kiosks. If you must touch these surfaces, use hand sanitizer or wash your hands afterward.
• Wear a face mask in indoor public spaces. The CDC recommends wearing the most protective mask possible that you'll wear regularly and that fits. If you are in an area with a high number of new COVID-19 cases, wear a mask in indoor public places and outdoors in crowded areas or when you're in close contact with people who aren't vaccinated.
• Avoid touching your eyes, nose and mouth.
• Cover coughs and sneezes.
• Clean your hands often. Be sure to wash your hands after using the bathroom, before eating, and after coughing, sneezing or blowing your nose.
  • Wash your hands often with soap and water for at least 20 seconds.
  • If soap and water aren't available, use a hand sanitizer that contains at least 60% alcohol. Cover all surfaces of your hands and rub your hands together until they feel dry.
• Don't eat or drink on public transportation. That way you can keep your mask on the whole time.

If you travel by bus or train and you aren't vaccinated, be aware that sitting or standing within 6 feet (2 meters) of others for a long period can put you at higher risk of getting or spreading COVID-19. Follow the precautions described above for protecting yourself during travel.

Even if you fly, you may need transportation once you arrive at your destination. You can search car rental options and their cleaning policies on the internet. If you plan to stay at a hotel, check into shuttle service availability.

If you'll be using public transportation and you aren't vaccinated, continue physical distancing and wearing a mask after reaching your destination.

When it's time to pack for your trip, grab any medications you may need on your trip and these essential safe-travel supplies:

• Face masks
• Tissues
• Alcohol-based hand sanitizer (at least 60% alcohol)
• Disinfectant wipes (at least 70% alcohol)
• Thermometer

Anyone can get very ill from the virus that causes COVID-19. But older adults and people of any age with certain medical conditions are at increased risk for severe illness. This may include people with cancer, serious heart problems and a weakened immune system. Getting the recommended COVID-19 vaccine and booster doses can help lower your risk of being severely ill from COVID-19.

Travel increases your chance of getting and spreading COVID-19. If you're unvaccinated, staying home is the best way to protect yourself and others from COVID-19. If you must travel and aren't vaccinated, talk with your health care provider and ask about any additional precautions you may need to take.

Even the most detailed and organized plans may need to be set aside when someone gets ill. Stay home if you or any of your travel companions:

• Have signs or symptoms, are sick or think you have COVID-19
• Are waiting for results of a COVID-19 test
• Have been diagnosed with COVID-19
• Have had close contact with someone with COVID-19 in the past five days and you're not up to date with your COVID-19 vaccines

If you've had close contact with someone with COVID-19, get tested after at least five days. Wait to travel until you have a negative test. Wear a mask if you travel up to 10 days after you've had close contact with someone with COVID-19.