UGA Regents Professor
Department of Entomology
College of Agricultural & Environmental Sciences
When warm weather approaches, so do pesky little bloodsucking pests.
The unassuming mosquito may be smaller than a dime, but it packs a serious punch, killing more people each year than any other animal. And with average temperatures climbing around the globe, different mosquito species are making their way farther north than ever before and bringing their diseases—malaria, West Nile, dengue, and more—along for the ride.
But thanks to recent discoveries at the University of Georgia, it may soon become easier to fend off the swarm.
Regents Professor of Entomology Michael Strand’s lab found that microorganisms, or microbes, in a mosquito’s gut are essential for growth and development. Mosquito larvae spend anywhere from a few days to two weeks developing in pools of water that can be as small as an upside-down bottle cap. Microbes colonize the larvae’s digestive tracts, forming a community of microorganisms that enables the larvae to mature into adult mosquitoes.
Sting like a Bee
Mosquitoes aren’t the only insects Strand studies.
His interests lie in parasitology, or how parasites interact with the animals they feed from. Parasitic wasps, comprising over a million different species, are the perfect medium to study parasite-host interactions.
Around 100 million years ago, some parasitic wasps were infected by a virus that became part of their genome. Wasps coopted that virus to deliver different types of genes into hosts.
One way wasps accomplish that is by injecting the coopted virus into other insects along with their eggs. The virus then infects the insects’ cells in much the same way as modern medicine’s gene therapies that use viruses to introduce genes into human patients for disease prevention or treatment.
The virus’ genes suppress the host insect’s immune defenses, which would otherwise destroy the foreign eggs. The wasps can then hatch and develop into adults while slowly consuming the host from the inside out.