Be aware that those irritating houseflies buzzing around the kitchen pose a considerable health risk.
Summer in South Africa is associated with a leisurely braai, time in the pool… and those irritating flies buzzing around the house.
Flies aren’t just annoying they can spread disease – and may be far better at it than scientists previously thought.
Microbiome of flies researched
Penn State University researchers analysed the microbiome, or bacterial makeup, of 116 different houseflies and blowflies found across three continents. Both types of flies feed on rotting organic matter and faeces, which exposes them to a wide assortment of problematic bacteria.
Some of the flies carried hundreds of different bacteria species, including ones known to be harmful to humans, the researchers found.
The findings were published recently in the journal Scientific Reports.
“It will really make you think twice about eating that potato salad that’s been sitting out at your next picnic,” said study co-author Donald Bryant, a professor of biochemistry and molecular biology.
“It might be better to have that picnic in the woods, far away from urban environments, not a central park,” he said in a university news release.
Legs and wings
The analysis focused on bacterial content in various fly body parts.
Legs emerged as the most common means of bacterial transmission, the study authors said.
According to study co-author Stephan Schuster, a former Penn State professor, “The legs and wings show the highest microbial diversity in the fly body, suggesting that bacteria use the flies as airborne shuttles. It may be that bacteria survive their journey, growing and spreading on a new surface.”