stay away from any vehicle collisions involving Olympic participants, to avoid infection.

Last year, terminal shutdowns in and around Ningbo and Shenzhen, respectively the world’s third- and fourth-largest container ports by volume, led to congestion and delays, and caused some ships to reroute to other ports.

But if the coronavirus does manage to enter a big port again, the effects could quickly be felt in the United States. “If one of the big container terminals goes into lockdown,” Mr. Huxley said, “it doesn’t take long for a big backlog to develop.”

Airfreight could also become more expensive and harder to obtain in the coming weeks as China has canceled dozens of flights to clamp down on another potential vector of infection. That could especially affect consumer electronics companies, which tend to ship high-value goods by air.

For American companies, the prospect of further supply chain troubles means there may be another scramble to secure Chinese-made products ahead of potential closures.

Lisa Williams, the chief executive of the World of EPI, a company that makes multicultural dolls, said the supply chain issues were putting pressure on companies like hers to get products on the shelves faster than ever, with retailers asking for goods for the fall to be shipped as early as May.

Dr. Williams, who was an academic specializing in logistics before she started her company, said an increase in the price of petroleum and other raw materials had pushed up the cost of the materials her company uses to make dolls, including plastic accessories, fibers for hair, fabrics for clothing and plastic for the dolls themselves. Her company has turned to far more expensive airfreight to get some shipments to the United States faster, further cutting into the firm’s margins.

“Everything is being moved up because everyone is anticipating the delay with supply chains,” she said. “So that compresses everything. It compresses the creativity, it compresses the amount of time we have to think through innovations we want to do.”

Ana Swanson reported from Washington, and Keith Bradsher from Beijing.

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