But others, including Allianz Global Assistance, are going in the opposite direction and extending their coverage. Epidemics are usually not included in travel insurance coverage, but Allianz has said that for a limited time it will accommodate claims for trip cancellation and emergency medical care for travelers who become ill with the coronavirus. Those who cancel their trips to China, South Korea and the Lombardy and Veneto regions of Italy would also be covered, said Daniel Durazo, director of marketing and communications at Allianz Global Assistance USA.

Possibly.

If you travel to a city that does not have a large number of confirmed cases — or perhaps no cases at all — but the number of confirmed cases rapidly increases during your stay, it could affect what happens when you return home, Dr. Weisenberg said.

“You might be restricted on your re-entry,” Dr. Weisenberg said, adding that you could be asked to quarantine yourself at home, or be placed in a special facility.

Even if you are not quarantined by health officials, some companies are requiring employees who have been traveling to work remotely, he added. And things are changing rapidly.

“Those answers may vary depending on ongoing public health changes,” Dr. Weisenberg said. “Once we have widespread testing available, then it will be easier for travelers to have a better idea of what the risk is in different areas.”

As of right now, Dr. Weisenberg cautioned travelers who might be tempted by a cheap airfare to put a lot of thought into whether they should book. Their safest option is to limit travel until the world has a better understanding of the virus, he said.

“Think it through, don’t go on a whim,” he said.

Emily Palmer contributed reporting from New York

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