tiger mosquito

BBC NEWS – Mosquito-borne disease risk looms for UK – study

Parts of the UK could become home to mosquitoes capable of spreading dengue fever, chikungunya and zika virus by the 2040s and 2050s, health officials warn.

The UK Health Security Agency’s report is based on a worst-case scenario, which would see high emissions and temperatures rising by 4C by 2100.

It says other effects include a rise in heat-related deaths and flooding.

But many potential problems are still avoidable with swift action, it says.

Steep cuts to greenhouse gas emissions could avert some of the worst consequences, it adds.

The report, involving 90 experts, pulls together the “substantial and growing” evidence of the current effects of climate change on our health.

It also makes projections based on what it says is a “plausible worst-case scenario” that could happen if international commitments to tackle climate change are not properly kept.

Current United Nations Environment Programme estimates suggest the world is on track for about a 2.7C warming by 2100, based on current pledges, although the exact numbers are uncertain.

Prof Nigel Arnell, professor of climate change at the University of Reading, says: “Whilst we clearly hope temperatures won’t get that far, it is prudent to prepare for the worst case when planning health resources, if the consequences of us underestimating the risk are so significant.”

One major health concern is the UK becoming more suitable for invasive species such as the Asian tiger mosquito, also known as Aedes albopictus.

While the mosquito only carries harmful viruses after biting infected people, London could see regular cases of dengue fever by 2060, the report says.

The virus is most commonly seen in tropical regions and can make people seriously ill

England would be the first country in the UK to be affected, with Wales, Northern Ireland and parts of the Scottish Lowlands also becoming suitable habitats later in the century.

The mosquitoes have already been responsible for cases of dengue in France and chikungunya virus in Italy in recent years. 

The UK Health Security Agency (UKHSA) already has a surveillance system in placeto rapidly spot invasive mosquitoes, including a network of traps placed at UK borders that detect mosquito eggs. 

This would need to be expanded in the worst-case scenario, says Dr Jolyon Medlock, from the UKHSA.

If the insects go on to establish a home in the UK, people would also need to consider how to store water safely, as it is a common breeding ground for mosquitoes.

This would mean making sure buckets are not collecting stagnant water in gardens, paddling pools being covered and any potential rain-collecting vessels being upturned, he added.

Screenshot 2024-01-02 at 09.16.00

Mosquitoes are moving North in Europe

Over the past four decades, Europe has seen the spread of invasive mosquito species such as Aedes albopictus. Originating in the tropical forests of southeast Asia, this insect has spread globally, transported in cargo ships and even in private cars. It was first seen in Albania in 1979, then in Italy in 1990. By 2013, it was established in 8 European Economic Area countries, according to data from the European Centre for Disease Prevention and Control (ECDC), and by 2023 this had increased to 13.

Visit dengueacademy.com and learn more about dengue (for an international audience of healthcare professionals outside of the US and UK)

hashtag#dengue hashtag#denguefever hashtag#dengueacademy hashtag#travelmedicine

Dengue

Millions infected with dengue this year in new record as hotter temperatures cause virus to flare

 Dengue is sweeping across the Western Hemisphere in numbers not seen since record-keeping began more than four decades ago, with experts warning that rising temperatures and rapid urbanization are accelerating the pace of infections.

A record more than 4 million cases have been reported throughout the Americas and Caribbean so far this year, surpassing a previous record set in 2019, with officials from the Bahamas to Brazil warning of crowded clinics and new infections daily. More than 2,000 deaths in that region also have been reported. 

“This year is the year we’ve been seeing the most dengue in recorded history,” said Thais dos Santos, adviser on surveillance and control of arboviral diseases with the Pan American Health Organization, the regional office of the World Health Organization in the Americas. She noted that record keeping began in 1980. “Vector borne diseases, especially these diseases that are transmitted by mosquitoes … provide us a really good sentinel of what is happening with climate change.”