This Common Insect Can Carry and Spread COVID, New Study Shows

If you see this bug flying around, you may want to keep away.

Whether it's the buzzing sounds they make or their frightening appearances, it's likely that you're never exactly thrilled to see bugs in your home. On top of how they look and sound though, there are the germs they can carry, which seems particularly concerning during the ongoing COVID pandemic. Unfortunately, a new study published in the journal Parasites & Vectors is realizing some of those fears. The researchers from Kansas State University (KSU) and Agricultural Research Service found that it's possible for one common insect to carry and transmit COVID for up to 24 hours after it's infected. Keep reading to find out which creepy crawler you need to be on the lookout for, and for more on bugs to beware of, check out 5 Things You're Buying That Bring Bed Bugs Into Your House, Experts Say.

A new study says house flies can carry and transmit COVID.

flies on garbage bag, towels
Mr.Samarn Plubkilang / Shutterstock

The KSU study, which was published on Apr. 20, determined that house flies are able to carry and transmit COVID. To reach that conclusion, the scientists exposed house flies to COVID in a lab and then tested them for infectivity. Environmental samples were also tested for infectivity after contact with the COVID-exposed flies. Samples were collected at various times after exposure. According to the researchers, they found that "house flies acquired and harbored infectious SARS-CoV-2 for up to 24 [hours] post-exposure."

In addition, the house flies were able to transmit COVID to the surrounding environment up to 24 hours after being exposed to the virus. Environmental samples that were touched by the exposed flies were contaminated with viral RNA, though those samples did not contain an infectious virus.

And for more critters to look out for, These Awful Bugs You Forgot About May Soon Come Back, Exterminators Warn.

More studies are needed to determine if house fly COVID transmission occurs naturally.

black fly trying to feed
pamirc / iStock

Because the research was conducted in a lab, the authors say further studies are warranted to determine if house fly transmission occurs naturally and the potential public health implications of such events. Juergen Richt, PhD, director of KSU's Center on Emerging and Zoonotic Infectious Diseases (CEZID) and co-author of the study, told Verywell Health that he and his fellow researchers decided to test house fly transmission because "there are many cases of COVID-19 where we don't know how someone contracted the virus."

Richt explained that house flies are "known to be attracted to biological fluids that can be contaminated with the virus," but he said the likelihood of catching COVID from a house fly is rare.

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House flies have been known to transmit other bacteria and disease.


According to the National Environmental Health Association (NEHA), house flies can transmit disease and bacteria to people. "The common housefly can transmit the pathogens that cause shigellosis, typhoid fever, E. coli, and cholera," the NEHA explains. "The disease-causing agents can either be transmitted by the body hairs or by the tarsi which are transmitted to food or surfaces when the fly lands. Additionally, pathogens can be transmitted when a fly regurgitates onto food in order to liquefy material for digestion."

And for another creepy creature to beware of, If You're Going to the Beach, Watch Out for This Parasitic Bug.

Another study has shown mosquitoes and biting midges cannot transmit COVID.

woman looking at her arm, skin with a bug, mosquito on it
sun ok / Shutterstock

The good news is, another common set of bugs does not seem to be able to transmit the novel coronavirus to people. On Mar. 4, an article published in Journal of Medical Entomology suggested that mosquitoes and biting midges are unable to transmit COVID. "We think that these species are unable to be biological vectors of SARS-CoV-2," Richt, who was also involved in that study, said in a statement. "The likelihood for transmission of SARS-CoV-2 by these insects is extremely low."

While direct transmission from these insects to humans may not be anything to worry about, "maybe mosquitoes and midges can be mechanical vectors" like flies, said Richt. "We believe that, in some of these cases, where you cannot find any direct transmission of the virus from interaction with positive people, that fomites in various ways could play a role."

And for more bug news, If You See This Bug in Your Home, Don't Step on It, Experts Warn.

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