Current weather conditions in the United Kingdom are ideal for a significant increase in mosquito populations, according to an expert. Dr. Mojca Kristan, an assistant professor in medical entomology at the London School of Hygiene and Tropical Medicine, stated that the combination of recent warmth and standing water provides the perfect environment for mosquitoes to lay eggs and hatch.
The recent heatwave, following periods of rain, has created conditions where mosquito eggs can develop rapidly. "Weather conditions in the UK at the moment are perfect for mosquitoes," Dr. Kristan said. "They like warmth as well as standing water to lay their eggs in."
Female mosquitoes require blood meals to develop their eggs, making this period prime time for biting. While the common house mosquito, which primarily feeds on birds but will bite humans, is widespread, larger species like the banded mosquito, known for painful, itchy bites, are also present.
Beyond nuisance bites, the conditions also raise concerns about the potential for disease-carrying mosquito species to establish themselves in the UK. While invasive species such as Aedes albopictus (Asian tiger mosquito) and Aedes aegypti (Egyptian mosquito), capable of transmitting diseases like dengue, chikungunya, and Zika, are not currently established in the UK, eggs of Aedes albopictus have been detected. Modelling studies suggest that by the 2060s, the climate in London and surrounding areas could support the endemic transmission of dengue fever.
Dengue, chikungunya, and Zika viruses are already present in parts of Europe, particularly the Mediterranean. Symptoms of dengue fever can mimic the flu, including high temperature, severe headache, and muscle and joint pain. Chikungunya also presents with fever, joint pain, and rash. While most Zika infections are mild, it poses serious risks to pregnant women, potentially causing stillbirth, miscarriage, developmental problems, and microcephaly.
Malaria is not currently endemic in the UK, with around 2,000 imported cases reported annually in travelers. Experts consider it unlikely that malaria will become endemic in the UK.
Dr. Kristan emphasized the need for vigilance. "At the moment there's a low risk of bites from UK mosquitoes spreading serious illness, but we have to be alert to the threat of new disease-carrying mosquito species as climate change makes Britain a more attractive place for mosquitoes to survive and thrive," she stated.
Recent weather patterns in the UK have included record-breaking June temperatures, with highs of 36.1°C, alongside severe thunderstorms and heavy rainfall, creating numerous pockets of standing water. This combination of factors is highly conducive to mosquito breeding.
To mitigate the risk of bites, Dr. Kristan advises using insect repellent, covering exposed skin with long sleeves, and wearing socks in the evening, particularly around the ankles where mosquitoes are known to bite.