Aedes

Other countries have working systems.

Brazil approved the first unconstrained environmental release of an engineered insect, a variant of the Aedes aegypti mosquito, which carries diseases like dengue fever and Zika virus.

The modified males carry a gene that kills their offspring at the larval stage.

Adding them to the population means they compete with ordinary Aedes males for mating opportunities.

Since females mate only once, females who mate with them produce no surviving offspring.

In Brazilian cities where they've been released, wild populations have dropped 80 to 96%.

The four serotypes are similar enough that we call all of them dengue, but they're immunologically different enough that infection with one doesn't make you permanently immune to the other three.

The virus is transmitted primarily by Aedes aegypti mosquitoes, with Aedes albopictus also capable of transmission.

Both of those occur in the U.S., and Aedes aegypti is especially comfortable living around humans.

The virus may need to find its way to Florida, but the machinery capable of transmitting it is already there.

Many dengue infections are asymptomatic or mild.

They travel to Florida while virus is present in their blood.

They may be pre-symptomatic, or mildly ill, or never noticeably sick.

A female Aedes aegypti then bites them and takes in dengue virus with the blood meal.

He welcomes additional heroes onto the quest and secures the goodwill and aid of locals in various ports.

He even tries to negotiate with King Aedes for the fleece, offering the Argonauts his services in subduing Aedes' enemies.

Soft words are his instrument of choice, and Jason uses them on everyone.

Welcome to the Ad Nauseam Podcast, where classical gourmands everywhere can finally get their fill.

And finally, Toxoplasma gondii, There's been an increased density of the small mammal hosts, as well as improved oocyte survival and infectivity, leading to new geographic areas of involvement.

Onto dengue, a flavivirus that is transmitted through Aedes mosquito bites and is associated with a viremia that can spread the infection also through infected blood, organs, and tissues.

It's endemic throughout the tropics and subtropics, and the area of risk has increased significantly in the face of urbanization, human migration, and warming.

It's estimated that there are over 50 million asymptomatic cases a year, of symptomatic cases a year, but 40 to 80% of cases are actually asymptomatic.

We know that doubling of atmospheric carbon dioxide will increase transmission capacity of the mosquitoes 100-fold in temperate areas.

But actually, climate change and urbanization could favor dengue transmission over malaria in sub-Saharan Africa, which is really the epicenter of transmission.

The Anopheles gambiae mosquitoes transmit infection best at about 25 degrees centigrade, whereas the Aedes aegypti mosquitoes transmit best at about 29 degrees centigrade.

But this is not a sharp cutoff.

And within Culicidae, mosquitoes are divided into several subfamilies and many genera.

The overwhelming majority of species that are important to human health belong to just three of these genera: Anopheles, Aedes, and Culex.

Anopheles mosquitoes are best known for transmitting malaria.

Aedes mosquitoes include species such as Aedes aegypti and Aedes albopictus, which can transmit yellow fever, dengue, and Zika.

Culex mosquitoes are important vectors for West Nile virus and Japanese encephalitis.

Despite their reputation as bloodsuckers, mosquitoes primarily survive on plant sugars.

So...

So in Singapore, it's the Aedes mosquito, right? We all know that.

That spreads dengue.

But apparently in Europe, it's a different species.

Their visit comes as dengue cases in Europe surged 300% between 2015 and 2024.

Project Wolbachia involves releasing lab-grown male Aedes mosquitoes infected with Wolbachia bacteria, which curbs their ability to reproduce.

The approach has proven effective.

Since 2016, populations at project sites have fallen by 80-90%, while dengue risk has dropped by more than 70%.