UKHSA Advises Travellers to Take Mosquito Bite Precautions as Chikungunya Cases Reach Highest Levels in Over a Decade in England

New data from the UK Health Security Agency (UKHSA) highlights a mixed picture for mosquito-borne infections among UK travellers, with dengue cases dropping but chikungunya infections seeing a sharp rise.

As families plan Easter and spring getaways, officials are urging travellers to take simple steps to protect themselves against mosquitoes abroad.

Dengue Falls, But Chikungunya Hits Highest Levels Since 2014

The latest UKHSA Travel-associated Infections Report reveals that dengue infections have fallen dramatically in 2025, dropping from 904 cases in 2024 to just 344.

However, chikungunya cases tell a different story.

A total of 160 infections were reported in 2025, marking a 43% increase from 112 cases in 2024 and the highest annual total recorded since 2014.

Most of these cases occurred between April and September, highlighting the peak travel season.

The majority of infections were reported in London (56%), with Sri Lanka, India, and Bangladesh being the most common travel destinations linked to the virus.

Understanding Chikungunya and Its Risks

Chikungunya is a mosquito-borne disease spread by Aedes aegypti and Aedes albopictus mosquitoes, which are not established in the UK.

While the infection is rarely fatal, it can cause sudden fever, severe joint pain, headaches, rashes, and sensitivity to light.

For some, joint discomfort can persist for months or even years, with up to 12% still experiencing pain three years after infection.

Two chikungunya vaccines have recently been approved in the UK and are available privately at travel clinics after a professional assessment.

Dr. Philip Veal, Consultant in Public Health at UKHSA, explained: “Chikungunya can be a prolonged and painful illness.

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Travellers returning from Asia and the Indian Ocean region remain at risk, so precautions against mosquito bites are essential.”

Malaria Remains a Persistent Threat

Malaria continues to affect returning travellers, with 1,629 cases reported in 2025, a slight decrease from 1,812 in 2024.

Most infections occurred between May and October.

Malaria is potentially fatal, but entirely preventable when antimalarial tablets and mosquito avoidance measures are used correctly.

UK travellers are strongly advised to seek advice tailored to their destination before departure.

Other Travel-Associated Infections

UKHSA also reports:

• Oropouche virus disease: Three imported cases linked to Brazil, marking the first report in England, Wales, and Northern Ireland.
• Cholera: 14 cases in 2025, mostly travel-related, primarily from Pakistan, India, and Ethiopia.
• Zika virus disease: Cases decreased to 7 from 16 in 2024, mostly linked to travel to India and Thailand.

These figures show the importance of basic preventative measures: using insect repellent, covering exposed skin, and sleeping under treated bed nets.

Expert Advice for Travellers

Dr. Dipti Patel, Director of the National Travel Health Network and Centre, said: “If you’re planning to travel over Easter or spring, preparation is key.

Simple precautions like DEET-based repellent, covering up, and using insecticide-treated bed nets can greatly reduce your risk.

Check Travel Health Pro for the latest guidance and consider discussing chikungunya vaccination with a travel clinic if your destination poses a risk.”

Impact and Consequences

The rising chikungunya numbers underline a growing health concern for travellers returning from Asia and the Indian Ocean region.

While dengue is declining, the persistence of malaria and other mosquito-borne diseases emphasizes the ongoing need for vigilance.

Failure to follow protective measures can result in prolonged illness, potential complications, and even rare fatalities among vulnerable groups.

What’s Next?

UKHSA continues to monitor global outbreaks and will update guidance as necessary.

Travellers are encouraged to plan ahead, consult healthcare professionals, and stay informed about disease risks at their destinations.

Summary

While UK travellers are enjoying improved protection against dengue, chikungunya and malaria remain significant health risks.

Awareness, preparation, and preventative measures remain the most effective strategies for safe travel.

Bulleted Takeaways

• Chikungunya cases rose 43% in 2025, with 160 infections reported, mostly from travellers returning from Sri Lanka, India, and Bangladesh.
• Dengue infections dropped significantly from 904 in 2024 to 344 in 2025.
• Malaria cases remain high at 1,629, predominantly during late spring and summer.
• First imported Oropouche virus cases reported in the UK.
• Preventative measures include DEET-based repellent, covering exposed skin, sleeping under treated bed nets, and considering chikungunya vaccination.
• Travellers are urged to consult Travel Health Pro and professional clinics 4–6 weeks before travel for tailored advice.