By Devika Rao
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the explainer
Kissing bug disease has a growing presence in the US
The disease has had a steady stream of cases in the last 10 years
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Several kissing bug species are common in the southern U.S.
(Image credit: Universal Images Group / Getty Images)
Devika Rao, The Week US
25 September 2025
The parasitic kissing bug disease is not new, but it has become increasingly common to the point of becoming endemic in the U.S. Because of this, the insect-borne illness has become a point of interest for researchers. The disease can go unnoticed, but in severe cases, it can lead to lifelong chronic health issues.
What is kissing bug disease?
Also called Chagas disease, it is caused by the parasite Trypanosoma cruzi. This disease is spread by triatomine bugs, also called kissing bugs because they are “bloodsucking insects that tend to bite people’s faces,” said The New York Times.
The parasite is “mainly found in rural areas of Mexico and Central and South America,” said the Centers for Disease Control and Prevention. However, the disease has spread enough to officially be considered endemic to the U.S., according to a report published in the journal Emerging Infectious Diseases.
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The triatomine bugs can infect people and other animals, including dogs. The disease goes largely unnoticed, as “most people in the United States only get diagnosed if they go to donate blood,” said the Times. “Only about 1% of people” infected with Chagas disease in the U.S. have been diagnosed. Many carry the disease without any symptoms, but it may also manifest as an acute or long-lasting infection.
The acute phase usually occurs within weeks or months of the parasite being contracted and can cause swelling at the infection site, as well as fever, fatigue, body rash, eyelid swelling and body aches. It could also cause gastrointestinal problems and swollen glands.
While acute infection is usually temporary, a chronic phase can appear 10 to 20 years after infection in about 20% to 30% of cases. This can lead to perpetual heart issues, such as an “enlarged heart, heart failure, altered heart rate or rhythm, or sudden death,” as well as digestive problems, like an “enlarged esophagus or colon, leading to trouble eating or going to the bathroom,” said the Mayo Clinic.
How common is it?
Approximately 8 million people globally, including an estimated 280,000 in the U.S., have kissing bug disease, and most are not aware of it, according to the CDC. Cases of the disease in humans have been found in Arizona, Texas, Louisiana, Missouri, Mississippi, Arkansas, Tennessee and California, while cases of Chagas disease in animals have also been found in New Mexico, Oklahoma, Nebraska, Alabama, Georgia, Florida, South Carolina, North Carolina, Kentucky, Virginia and Maryland.
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“Several triatomine species are common in the southern United States, where they transmit T. cruzi and invade human dwellings,” said the Emerging Infectious Diseases report. The disease is already considered endemic in 21 countries in the Americas.
However, if you ask physicians about Chagas, they would think it’s either ”transmitted by ticks” or ”doesn’t exist in the U.S.,” said Bernardo Moreno Peniche, one of the authors of the review, to The Guardian.
Experts recommend sealing windows to prevent insects from entering, as well as clearing wood piles from near the property, where they can congregate. And be careful when eating raw fruits and vegetables, which could potentially contain feces from the insects.
The good news is that the chances of contracting the disease in the U.S. are still rare. Most Americans should “not be worried at all,” Caryn Bern, an epidemiologist at the University of California, San Francisco, said to the Times.
Devika Rao, The Week US
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Devika Rao has worked as a staff writer at The Week since 2022, covering science, the environment, climate and business. She previously worked as a policy associate for a nonprofit organization advocating for environmental action from a business perspective.
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