United States health officials are urging travellers to remain vigilant as a mosquito-borne virus continues to circulate across parts of Asia, Africa, Europe, Latin America and the Indian Ocean.

Since the beginning of 2025, there have been approximately 240,000 chikungunya virus infections and 90 deaths in 16 countries, according to the European Centre for Disease Prevention and Control (ECDC).

In China, an outbreak has infected roughly 7,000 people since late June, with most cases concentrated in the city of Foshan, in Guangdong province, just north of Hong Kong. This marks the country’s largest chikungunya outbreak since the virus was first identified there in 2008.

Here is what we know about the disease and how it is spreading.

What is the chikungunya virus?

Chikungunya is a

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