What Is the Risk of Getting Chagas from a Kissing Bug Bite?
At a Glance
The risk of getting Chagas disease from a single kissing bug bite is generally very low. The disease is not transmitted by the bite itself, but through the bug's feces. Infection only occurs if you accidentally rub infected feces into the bite wound, your eyes, or your mouth.
In this answer
3 sections
A bite from a kissing bug does not automatically mean you will get Chagas disease [1][2]. In fact, the chances of contracting the disease from a single bite are generally very low [1][2]. Unlike ticks or mosquitoes, kissing bugs do not transmit the disease through their bite or their saliva [3][4]. To become infected, a specific sequence of events involving the bug’s feces must occur [3][4].
How the Infection Actually Happens
The medical term for this process is stercorarian transmission, which simply means infection through feces rather than a bite [3][5]. When a kissing bug feeds on a person’s blood—often biting multiple times in a cluster or a line—it may defecate (poop) on the skin during or shortly after its meal [6]. If the bug is carrying the parasite responsible for Chagas disease (Trypanosoma cruzi), the parasite will be present in this feces [3][4].
However, the parasite cannot pass through intact, healthy skin. Infection only happens if the infected feces accidentally gets into your body. This usually occurs when:
- You scratch the itchy bite, which rubs the bug’s feces into the open wound [3][4].
- You unconsciously touch the bug’s feces and then rub your eyes, mouth, or nose [3][4].
Without this accidental rubbing of feces into a wound or mucous membrane, the disease is not transmitted [3][4].
Why Geography Matters
Your risk of infection also heavily depends on where you live and the specific species of kissing bug in your area [5][7].
- In the United States: The risk of getting Chagas disease from a bug bite is considered very low [8][9]. The kissing bugs native to North America tend to be “sylvatic” (living in the wild rather than in homes), and they typically wait to defecate until after they have walked away from the person they fed on [8][9][10]. Because the feces are left far from the bite, it is much harder to accidentally rub them into the wound [8][10].
- In Central and South America: Certain species of kissing bugs have adapted to live inside human homes and are much more efficient at spreading the disease [10][6]. These species often defecate immediately while they are still feeding, leaving infected feces right next to the bite wound [6].
What to Do If You Are Bitten
Even in areas with high numbers of infected kissing bugs, many people are bitten without ever getting sick [11][8]. Studies show that the simple presence of an infected bug or a reported bite rarely guarantees an infection [11][8].
If you know or suspect you were bitten, taking the right steps can help manage your risk:
- Wash the area: Immediately wash the bite and surrounding skin with soap and water to remove any potential feces.
- Avoid scratching: Try not to touch or scratch the bite, and keep your hands away from your eyes and mouth.
- Save the bug: If you catch the bug, place it in a small, sealed container (do not touch it with your bare hands). Many local health departments or university extension programs can test the bug for the parasite.
- Follow up on test results: If the bug tests positive for the parasite, contact an infectious disease specialist or your primary care provider for a blood test.
- Watch for symptoms: Contact a doctor if you develop symptoms in the weeks following a suspected bite. Watch for severe swelling around one eye (Romaña’s sign), a hard, swollen, red nodule at the bite site (called a chagoma), or general flu-like symptoms such as fever, fatigue, or body aches.
Common questions in this guide
Do all kissing bug bites cause Chagas disease?
How is Chagas disease actually transmitted?
What should I do if a kissing bug bites me?
What are the early signs of Chagas disease after a bite?
Is the risk of getting Chagas disease higher in certain countries?
Questions to Ask Your Doctor
Curated prompts to bring to your next appointment.
- 1.If a kissing bug I saved tests positive for the parasite, what specific blood tests should I take, and how soon after the bite should they be done?
- 2.I noticed swelling near my eye a few weeks after a suspected bug bite; could this be Romaña's sign, and how do we test for acute Chagas disease?
- 3.Since I was bitten in an area where kissing bugs are common, do you recommend routine screening for Chagas even if I don't have symptoms?
- 4.How do we distinguish an allergic reaction to the bug's bite from an actual infection at the bite site?
Questions For You
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References
References (11)
- 1
Screening of at-risk blood donors for Chagas disease in non-endemic countries: Lessons from a 2-year experience in Tuscany, Italy.
Mangano VD, Prato M, Marvelli A, et al.
Transfusion medicine (Oxford, England) 2021; (31(1)):63-68 doi:10.1111/tme.12741.
PMID: 33295054 - 2
Field evidence of Trypanosoma cruzi infection, diverse host use and invasion of human dwellings by the Chagas disease vector in Florida, USA.
Beatty NL, Bhosale CR, White ZS, et al.
PLoS neglected tropical diseases 2025; (19(7)):e0012920 doi:10.1371/journal.pntd.0012920.
PMID: 40623053 - 3
Chagas bugs and trypanosoma cruzi: Puppets and puppeteer?
Córdoba-Aguilar A
Acta tropica 2020; (211()):105600 doi:10.1016/j.actatropica.2020.105600.
PMID: 32592685 - 4
Intestinal microbiota - A modulator of the Trypanosoma cruzi-vector-host triad.
Teotônio IMSN, Dias N, Hagström-Bex L, et al.
Microbial pathogenesis 2019; (137()):103711 doi:10.1016/j.micpath.2019.103711.
PMID: 31491548 - 5
What makes an effective Chagas disease vector? Factors underlying Trypanosoma cruzi-triatomine interactions.
de Fuentes-Vicente JA, Gutiérrez-Cabrera AE, Flores-Villegas AL, et al.
Acta tropica 2018; (183()):23-31 doi:10.1016/j.actatropica.2018.04.008.
PMID: 29625091 - 6
An overview on the ecology of Triatominae (Hemiptera:Reduviidae).
Galvão C, Justi SA
Acta tropica 2015; (151()):116-25.
PMID: 26086951 - 7
Zombie bugs? Manipulation of kissing bug behavior by the parasite Trypanosoma cruzi.
Ramírez-González MG, Flores-Villegas AL, Salazar-Schettino PM, et al.
Acta tropica 2019; (200()):105177 doi:10.1016/j.actatropica.2019.105177.
PMID: 31539526 - 8
Kissing Bug Intrusions into Homes in the Southwest United States.
Klotz SA, Smith SL, Schmidt JO
Insects 2021; (12(7)) doi:10.3390/insects12070654.
PMID: 34357314 - 9
Autochthonous Chagas Disease: How Are These Infections Happening?
Klotz SA, Schmidt JO
The American journal of medicine 2020; (133(12)):e683-e686 doi:10.1016/j.amjmed.2020.06.017.
PMID: 32682868 - 10
Detection of Trypansoma cruzi in Kissing Bugs (Hemiptera: Reduviidae: Triatominae) Collected Across Oklahoma.
Allen KE, Lineberry MW
Journal of medical entomology 2022; (59(2)):675-680 doi:10.1093/jme/tjab211.
PMID: 34993549 - 11
Low Trypanosoma cruzi transmission risk to humans in the Trans-Pecos region of Texas.
Dye-Braumuller KC, Lynn MK, Gorchakov R, et al.
Parasite epidemiology and control 2020; (11()):e00180 doi:10.1016/j.parepi.2020.e00180.
PMID: 33005772
This page provides educational information about kissing bug bites and Chagas disease transmission risks. It does not replace professional medical advice, so please consult a healthcare provider or an infectious disease specialist if you suspect you have been bitten.
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