Travel restrictions have become more serious and widespread over the past few days. The Centers for Disease Control and Prevention has now categorized about 30 countries as Warning Level 3 and is requiring anyone entering from those places to stay home for 14 days. President Trump shut down most travel from Europe to the United States beginning March 13.

Still, many people need to travel internationally and domestically, whether they are coming home from closing colleges, returning from vacation or going on urgent trips. Those travelers are likely to come into contact with many high-touch objects such as self check-in kiosks, escalator handrails and tray tables, so airports and airlines are making changes aimed at reducing the potential for what’s called community transmission.

They are working in concert with the C.D.C., the World Health Organization and local public health officials to come up with the best policies and procedures, with changes made as new information comes in.

Here’s what passengers are likely to see and experience at the airport and onboard.

A lot more cleaning

Surfaces can harbor the virus, so janitorial staff at airports across the country are cleaning more frequently and paying special attention to disinfecting high-touch areas like handrails, elevator buttons, door handles, counter tops and food court areas. Seattle-Tacoma International Airport, for example, said shuttle buses that transport employees, serve rental car facilities, and shuttle passengers to and from planes will be cleaned multiple times a day.