United States well being officers are urging travellers to remain vigilant as a mosquito-borne virus continues to flow into throughout elements of Asia, Africa, Europe, Latin America and the Indian Ocean.
Because the starting of 2025, there have been roughly 240,000 chikungunya virus infections and 90 deaths in 16 international locations, in accordance with the European Centre for Illness Prevention and Management (ECDC).
In China, an outbreak has infected roughly 7,000 folks since late June, with most instances concentrated within the metropolis of Foshan, in Guangdong province, simply north of Hong Kong. This marks the nation’s largest chikungunya outbreak for the reason that virus was first recognized there in 2008.
Here’s what we all know in regards to the illness and the way it’s spreading.
What’s the chikungunya virus?
Chikungunya is a viral illness that’s unfold via the chunk of contaminated Aedes aegypti mosquitoes. These mosquitoes additionally carry and unfold dengue, yellow fever and the Zika virus.
The identify, chikungunya, derives from a phrase within the Kimakonde language, spoken in Tanzania and Mozambique, that means “to turn out to be contorted”.
Most often, sufferers will really feel higher inside every week. In lots of instances, nonetheless, the joint ache can final for months and even years.
There isn’t a treatment for the chikungunya virus, however deaths are uncommon. If an contaminated mosquito bites a wholesome human, it injects the virus into the bloodstream.
Folks most vulnerable to severe sickness from chikungunya embrace newborns, older adults and people with present well being issues comparable to coronary heart illness or diabetes.
There isn’t a treatment for the chikungunya virus, however the demise fee is low, besides in high-risk populations.
If an contaminated mosquito bites a wholesome human, it injects the virus into the bloodstream. If a non-infected mosquito bites an individual who’s already contaminated, it sucks the virus from that individual’s blood and turns into a service able to transmitting the virus to others via bites.
How unhealthy is the present unfold of the virus?
In accordance with the World Well being Group (WHO), the present surge in instances started in early 2025, with main outbreaks in Indian Ocean Islands, together with La Reunion, Mayotte and Mauritius.
In La Reunion, greater than 47,500 instances of chikungunya and 12 related deaths had been reported as much as Might 2025, with sustained excessive transmission throughout the island, in accordance with the WHO. The ECDC additionally experiences that as of July 18, there have been greater than 54,000 instances reported from La Reunion.
That is now probably the most severe chikungunya outbreak in La Reunion for the reason that 2005–2006 epidemic, which noticed an estimated 244,000 to greater than 300,000 instances, and prompted large-scale public well being efforts to manage mosquito breeding and restrict transmission.
The virus has additionally unfold to different international locations, together with Madagascar, Somalia and Kenya, and has proven indicators of epidemic-level transmission in elements of Southeast Asia, in addition to India, the place monetary capital Mumbai has seen a surge in instances since July.
The WHO has additionally raised considerations in regards to the rising variety of imported chikungunya instances in Europe. Since Might 1, about 800 imported instances have been reported in mainland France.
In accordance with the ECDC, the Americas as a area have reported the best variety of chikungunya instances globally. As of mid-July 2025, the international locations with probably the most instances within the area embrace Brazil (185,553), Bolivia (4,721), Argentina (2,836) and Peru (55).
In China, infections have been reported in at the very least 12 cities throughout southern Guangdong province, along with Foshan.
Chinese language authorities mentioned that an “imported case triggered native transmission” in July, however didn’t specify the place the an infection originated. In accordance with specialists, rising international temperatures have led to hotter and wetter climate, permitting mosquitoes to thrive.
Individually, on Saturday, Hong Kong confirmed its first case of chikungunya: a 12-year-old boy who developed a fever, rash and joint ache since July 31, after visiting Foshan. This was the territory’s first case of the virus in six years.
How are China and different international locations combating the unfold?
In accordance with a Bloomberg information report, China has promised to take swift and decisive motion to include the unfold of the chikungunya virus.
Drones are getting used to seek out locations the place mosquitoes are breeding. On the identical time, scientists are releasing massive “elephant mosquitoes” – about 2cm (0.8 inches) lengthy – whose larvae eat the smaller mosquitoes that unfold the virus. Well being specialists hope these mosquito helpers will play an vital position in stopping the outbreak.
In accordance with a report by the BBC, residents of affected areas in China have been ordered to eradicate standing water in and round their houses – together with in flowerpots, espresso machines and empty bottles. Noncompliance could lead to fines of as much as 10,000 yuan (roughly $1,400), and in additional severe instances, folks may face prison expenses for “obstructing the prevention of infectious illnesses”.
Citing native sources, The New York Instances mentioned that in some situations, contaminated residents in Foshan are being moved to “quarantine wards”, the place they’re saved behind mosquito nets and screens. Some sufferers additionally say they got no alternative however to hunt therapy at their very own expense.
In different places, comparable to La Reunion and Mayotte, authorities have additionally launched enhanced surveillance, mosquito management initiatives and focused vaccination efforts.
The Basque Nation in Spain activated preventive protocols after a case was detected in Hendaye, simply throughout the border in France. The protocols embrace elevated surveillance in border cities and inspiring folks to make experiences via apps comparable to Mosquito Alert.
How can chikungunya be prevented and handled?
Well being authorities advise defending oneself in opposition to mosquito bites as the best technique in opposition to the unfold of chikungunya.
This will contain carrying lengthy sleeves and trousers, making use of mosquito repellents, eradicating our bodies of standing water the place mosquitoes can breed, and staying in closed, air-conditioned areas indoors or behind mosquito netting when outside.
Whereas there aren’t any particular medicines to deal with the virus, relaxation, fluids and ache relievers could assist alleviate signs, in accordance with the US Facilities for Illness Management and Prevention (CDC).
Nevertheless, some ache relievers could also be unsafe throughout a suspected an infection. The CDC recommends avoiding non-steroidal anti-inflammatory medication (NSAIDs) till dengue is dominated out, as they’ll increase the danger of bleeding.
