• UK reports a 170% increase in chikungunya cases in 2025.
• 73 cases linked to travel from countries like India, Sri Lanka, and Mauritius.
• The UK Health Security Agency warns of ongoing risks from mosquito bites.
• First cases of Oropouche virus detected in UK, associated with travel to Brazil.
• No risk of local transmission as mosquitoes responsible are not present in the UK.

The UK has observed a substantial increase in chikungunya virus cases, with 73 reported infections in the first half of 2025, marking an increase of 170.37% compared to the 27 cases recorded during the same period in 2024. This data comes from the UK Health Security Agency (UKHSA), which indicated that all instances were linked to international travel, primarily from areas experiencing local outbreaks, notably Sri Lanka, India, and Mauritius according to BBC, SCMP, and AA.

The UKHSA emphasizes the health risks associated with chikungunya, a disease transmitted by mosquito bites, causing symptoms like high fever and joint pain. Although recovery is usually expected within two weeks, some individuals may encounter persistent joint pain that can last for months or longer. “Chikungunya can be a nasty disease,” noted Philip Veal, a consultant in public health at UKHSA, stressing the need for effective prevention measures. “Simple steps, such as using insect repellent, covering up your skin, and sleeping under insecticide-treated bed nets, can greatly reduce the risk,” he advised, as highlighted in reports from both SCMP and BBC.

In addition to chikungunya, the UK has detected its first instances of the Oropouche virus, which also arises from travel-related exposures, specifically from Brazil. This emerging virus is spread primarily by midge bites and can produce flu-like symptoms including fever and joint pain. The UKHSA advises anyone experiencing such symptoms after returning from travel in affected regions to seek immediate medical attention. Reports show this issue has gained significance as travel-associated infections, including those for cholera, have also risen, highlighting the interconnected nature of global travel and health risks, according to AA and SCMP.

Moreover, despite the ongoing threats from these viruses, the risk of local transmission of chikungunya remains low in the UK, as the two mosquito species responsible are not present in the region. The situation has prompted health officials to intensify warnings and educational efforts surrounding preventative measures for travelers headed to endemic areas, as stated by the UKHSA in various communications cited across BBC, SCMP, and AA.