Mosquitoes

Dengue fever, once confined to the tropics, now threatens the U.S.

Climate change is expanding the habitat of the mosquitoes that carry the disease, allowing them to spread further north.

Meg Norris was traveling in Argentina in April when the first signs of dengue fever hit her. The weather in Salta, just south of the Bolivian border, was warm, but Norris, a 33-year-old from Boulder, Colorado, zipped a fleece sweatshirt around her body to stop herself from shivering.

“I thought it was sun poisoning,” she said.

Mosquitoes that carry West Nile are becoming resistant to insecticides

John VanDenBerg suspects he was gardening when a mosquito got him.

It was September 2018, and VanDenBerg, then 67, had been feeling a little “off” for a few days, he said, like maybe he had the flu.

But one morning, as he was walking out of his Colorado home, he collapsed.

Vanishing Birds

If you were alive in the year 1970, more than one in four birds in the U.S. and Canada has disappeared within your lifetime.

According to research published online in September by the journal Science, wild bird populations in the continental U.S. and Canada have declined by almost 30% since 1970.

Aedes aegypti: Beyond the Black and White

One look at Aedes aegypti gives an immediate impression of its menacing nature. The telltale dark and white bands on the mosquito’s legs and other body parts bring a sense of foreboding and hardship. Sleek, silent, and stealthy, Ae. aegypti is the primary vector for several important, debilitating, and sometimes fatal human diseases including dengue, Zika virus, yellow fever, and chikungunya. The species is cause for mounting concern on many levels, as its biology, behavior, and ability to adapt have made Aedes aegypti one of the most pervasive and daunting public health challenges in the modern world.

The first mosquito ever associated with the spread of disease, Ae. aegypti is also the most studied of all mosquito species.1 From its humble beginnings in the African wild to a footprint that spans the globe, this durable and opportunistic insect has become a formidable opponent of vector control efforts worldwide.

Vector-borne Diseases & Climate Change

Climate change creates new risks, particularly in the United States, for human exposure to vector-borne diseases (VBDs) — diseases which are transmitted to humans through the bites of insects (referred to as vectors) that carry the disease-causing pathogens. Common vectors include mosquitoes, ticks, and flies.

Climate change creates new uncertainties about the spread of VBDs such as the Zika virus, dengue fever, malaria, and Lyme disease by altering conditions that affect the development and dynamics of the disease vectors and the pathogens they carry.

Study: Digitally Managed Larviciding

A new study has found that larval source management (LSM) – treating mosquito breeding habitats – can still be effective in malaria elimination operations, especially with the aid of new digital technologies. LSM has been replaced in Africa by long-lasting insecticidal nets (LLINs) and indoor residual spraying (IRS), but these methods are becoming less effective due to mosquitoes’ growing resistance to insecticides.

Public Health in the Public Eye

Communicating the value of a vector control program. Securing much-needed funding. Informing the community about upcoming treatments. Answering complaints. Trying to change behavior. As if …

Top 5 Takeaways from Our Interview with Dr. Tracey McNamara

In mid-July, Valent BioSciences had the privilege of interviewing Dr. Tracey McNamara, DVM, DACVP, and Professor of Pathology in the College of Veterinary Medicine at …