Quick overview

• “Kissing bugs” (also called triatomine or conenose bugs) can transmit Trypanosoma cruzi, the parasite that causes Chagas disease.
• In the U.S., these bugs are found mainly in the South and Southwest, though detections have occurred across many states.
• Most U.S. Chagas cases were acquired in Latin America; locally transmitted infections in the U.S. do occur but are uncommon and often related to outdoor or peri‑domestic exposure in the South.
• Early infection may be mild or unnoticed; long‑term, untreated infection can lead to serious heart problems in a subset of people.
• Prevention focuses on keeping bugs out of homes and away from sleeping areas; treatment is available and works best when started early.

Why are headlines saying cases are “on the rise”?

Several factors are driving increased attention:

• More awareness and testing: Health systems and blood banks have expanded screening, uncovering infections that previously went undetected.
• Bug detections expanding: Citizen‑science projects and state labs are identifying triatomine bugs in more counties than before. That doesn’t always mean higher human infection, but it does raise vigilance.
• Climate and environment: Warmer temperatures, drought cycles, and human‑wildlife contact can influence vectors and reservoir hosts.
• Population movement: Many U.S. residents born in areas of Latin America where Chagas is endemic may have chronic infection without knowing it.

Bottom line: the number of recognized infections is likely increasing due to better detection, while the risk of local vector‑borne transmission in the U.S. remains low but real, primarily in southern states.

The bug and the parasite

Triatomine (“kissing”) bugs are night‑active insects that feed on blood. They’re attracted to carbon dioxide and body heat and may bite exposed skin near the mouth or eyes—hence the nickname. Not every triatomine carries the parasite, and not every bite results in infection.

Transmission happens when the bug defecates near the bite, and the parasite enters through the bite site or mucous membranes—often aided by scratching. The parasite (Trypanosoma cruzi) can also spread:

• From mother to baby during pregnancy (congenital transmission)
• Through contaminated blood or organ transplants (U.S. blood screening has greatly reduced this risk)
• Rarely, via contaminated food or beverages (mostly reported in Latin America)

Where are kissing bugs found in the U.S.?

Established triatomine populations occur mainly in the South, Southwest, and parts of the West. Reports include Texas, Arizona, New Mexico, Louisiana, Florida, and neighboring states, with sporadic detections farther north. They often live in outdoor shelters—woodpiles, rock stacks, chicken coops, sheds—and may enter homes through gaps or when attracted to lights.

Dogs and other animals can become infected and serve as sentinels, alerting to local parasite circulation.

Symptoms: acute and chronic phases

Acute (weeks to months after infection)

• Often mild or unnoticed
• Fever, fatigue, body aches
• Swelling or a nodule at the bite or entry site
• Occasional unilateral eyelid swelling (Romaña’s sign)

Chronic (years to decades later, if untreated)

• Most people remain without symptoms
• A subset develops cardiac disease: conduction abnormalities, arrhythmias, cardiomyopathy, heart failure, or stroke
• Digestive complications (e.g., megacolon, megaesophagus) occur mainly in certain regions of Latin America; they are less common in the U.S.

If you have possible exposure and concerning symptoms—or are from an endemic area—ask a clinician about testing for Chagas disease.

Diagnosis and treatment

• Diagnosis: In acute infection, parasite detection by specialized tests may be possible; in chronic infection, diagnosis relies on serologic blood tests (usually more than one type to confirm).
• Treatment: Antiparasitic medications—benznidazole and nifurtimox—are available in the U.S. Treatment works best early but can benefit many people with chronic infection, especially younger patients. Decisions are individualized based on age, pregnancy status, comorbidities, and disease stage. A specialist or an infectious diseases clinician often guides care.
• Follow‑up: People with chronic infection may need periodic cardiac evaluation even after treatment.

Important: do not start or stop any medication without medical advice.

Practical prevention tips

Home and sleeping areas

• Seal gaps around doors, windows, attics, and foundations; repair screens and weather stripping.
• Reduce insect entry points in bedrooms; consider bed nets if you sleep with windows open in high‑risk areas.
• Keep outdoor lighting to what’s necessary; use bulbs that attract fewer insects and position lights away from doors.

Yards and outbuildings

• Move woodpiles, brush, rock stacks, and compost away from the home.
• Keep pet bedding off the ground and, if possible, keep dogs indoors at night.
• Secure chicken coops and sheds; reduce nesting sites for rodents and other wildlife that can attract bugs.

If you find a suspected kissing bug

• Do not handle it with bare hands. Avoid crushing.
• Capture safely with gloves or a jar, or by gently sweeping into a container.
• If advised by your state or county program, preserve it in a sealed container (freezer or small amount of alcohol) and contact your local health department or cooperative extension for identification/testing guidance.

Who should consider testing?

• People born in, or who lived for extended periods in, Chagas‑endemic areas of Latin America.
• Children of mothers from endemic areas (congenital transmission is possible).
• Individuals with possible local exposure in the southern U.S. who have compatible symptoms or a confirmed triatomine exposure.
• Recipients of blood transfusions or organ transplants in places/times without screening (modern U.S. blood screening greatly reduces this risk).

Speak with a healthcare professional about your history; they can order appropriate tests and refer to specialists if needed.

How to recognize a kissing bug (vs. look‑alikes)

• Triatomines are typically larger than most household bugs (often 1–3 cm), with a cone‑shaped head and a long, straight proboscis tucked under the head.
• Many species show a banded pattern around the edge of the abdomen, sometimes orange or red.
• Common look‑alikes include assassin bugs and some leaf‑footed bugs; correct identification can be tricky—seek expert help.

Pets and Chagas disease

Dogs can become infected and may develop heart disease. If you live in a high‑risk area and your dog is ill or you’ve found triatomines near your home, consult your veterinarian. Preventive measures for homes and yards help protect pets as well as people.

Common myths and facts

• Myth: Any bite from a kissing bug gives you Chagas. Fact: Transmission requires infected bug feces contacting a break in skin or mucosa; not all bugs carry the parasite.
• Myth: Chagas isn’t in the U.S. Fact: The bugs and parasite are present; local transmission is rare but documented, and most U.S. cases were acquired abroad.
• Myth: There’s no treatment. Fact: Two antiparasitic medications exist; early treatment is most effective, and clinical follow‑up matters.

When to seek medical advice

• You have a suspected kissing bug exposure plus fever, swelling at a bite site, or other acute symptoms.
• You’re from (or spent years in) an endemic area and have never been tested.
• You have unexplained cardiac findings (e.g., new conduction abnormalities) and possible exposure history.

Tell your clinician about any bug exposures, travel/residence history, and whether pets or neighbors have encountered triatomine bugs.

Trusted resources

• CDC: Chagas disease overview and prevention — https://www.cdc.gov/parasites/chagas/
• WHO: Chagas disease fact sheet — https://www.who.int/news-room/fact-sheets/detail/chagas-disease-(american-trypanosomiasis)
• Texas A&M Kissing Bug citizen science and ID help — https://kissingbug.tamu.edu/
• American Heart Association scientific statement on Chagas and the heart — https://www.ahajournals.org/ (search “Chagas disease”)