Organizers of one of the tech industry’s biggest conferences have cancelled this year’s event over fears of coronavirus, in another sign of how the illness is hitting global business.

The event, MWC Barcelona, is the telecommunications sector’s biggest annual gathering, and draws attendees from many related sectors, including semiconductors, computing and consulting. Last year more than 100,000 people attended, including many from China.

“Global concern regarding the coronavirus outbreak, travel concern and other circumstances, make it impossible for the GSMA to hold the event,” the telecommunications-industry group said.

The news came after a string of high-profile companies dropped out of the conference in recent days, including Facebook, Intel, Cisco, Amazon and Ericsson. GSMA had already announced that travelers from China’s Hubai province would not be allowed to attend the meeting and that visitors from other parts of China would have to prove they’d been outside the country for at least 14 days.

The vast majority of coronavirus infections have occurred inside China — 45,000 in China versus 441 across the rest of the world, according to the World Health Organization. There has been only one confirmed death outside China compared with more than a thousand inside China, the WHO says.

But uncertainty about how the virus will spread has raised fears. The story of a traveling British businessman who appears to have passed the virus to people in at least three countries has fueled concerns.