{
  "slug": "chagas-disease",
  "question": "What are the odds of contracting Chagas disease in Latin America?",
  "category": "health",
  "tags": [
    "travel"
  ],
  "no_reliable_estimate": false,
  "perceived": {
    "description": "Outside specialist medicine, Chagas disease barely registers as a named threat. Most people in Latin America treat the triatomine \"kissing bug\" as a minor nuisance rather than a disease vector, and the 10-to-20-year lag between infection and visible cardiac damage means the connection between a childhood insect bite and adult heart failure is rarely made. Global awareness is even lower: in wealthy countries, Chagas is categorized as a \"neglected tropical disease,\" a bureaucratic label that accurately predicts how little attention it receives.\n",
    "kind": "intuition"
  },
  "native": {
    "display": "~10,000 deaths per year, global population",
    "numerator": 10000,
    "denominator": 5000000000,
    "unit": "per year",
    "population": "global adults"
  },
  "normalized": {
    "lifetime_us_adult": 0.000118,
    "display": "~1 in 8,500 lifetime (global adult average)",
    "log_value": -3.93,
    "assumptions": "WHO estimates more than 10,000 Chagas-attributable deaths per year globally, almost entirely in Latin America. Global adult population ~5 billion. Annual mortality rate: 10,000 / 5,000,000,000 = 0.000002 per adult per year. Compounded over 59 years (US adult remaining-life horizon from age 18): 1 - (1 - 0.000002)^59 ≈ 0.000118, or roughly 1 in 8,500. This is a global average; the risk is highly concentrated. In endemic rural Latin America (~100 million people at high risk per WHO), with ~9,000 deaths attributable to that population, the subgroup annual rate is ~9,000 / 100,000,000 ≈ 0.00009, compounding to ~1 in 190 over a lifetime — roughly 45× the global figure. The lifetime risk of ever becoming infected (not dying) in endemic areas is substantially higher: WHO estimates about 8 million currently infected from a population of more than 100 million at risk.\n",
    "uncertainty": {
      "low": 0.000075,
      "high": 0.0003
    },
    "scope": "global_adult_lifetime"
  },
  "sources": [
    {
      "url": "https://www.who.int/news-room/fact-sheets/detail/chagas-disease",
      "title": "Chagas disease (also known as American trypanosomiasis) — WHO Fact Sheet",
      "publisher": "World Health Organization",
      "source_type": "govt_report",
      "statistic": "~8 million people infected worldwide; more than 10,000 deaths per year; more than 100 million at risk",
      "excerpt": "\"About 8 million people worldwide, mostly in Latin America, are estimated to be infected with Trypanosoma cruzi … more than 100 million people are considered at risk of infection … leading to more than 10 000 deaths every year.\"\n",
      "source_date": "2026-04-08",
      "source_accessed": "2026-04-24",
      "archive_url": "http://web.archive.org/web/20250430004105/https://www.who.int/news-room/fact-sheets/detail/chagas-disease",
      "calculation_notes": "The 10,000+ annual deaths figure is the WHO headline for the mortality denominator. Divided by 5 billion global adults gives an annual rate of 2.0 × 10⁻⁶. The 100+ million at-risk figure is used to contextualize the subgroup lifetime risk calculation in the assumptions field.\n"
    },
    {
      "url": "https://www.sciencedirect.com/science/article/pii/S2667193X24002084",
      "title": "The epidemiology of Chagas disease in the Americas",
      "publisher": "The Lancet Regional Health – Americas",
      "source_type": "peer_reviewed",
      "statistic": "~8 million infected in the Americas; Bolivia, Paraguay, and the Chaco region carry the highest transmission rates; cardiac involvement in 20–30% of chronically infected individuals",
      "excerpt": "\"An estimated 8 million people are infected with Trypanosoma cruzi in the Americas. The highest-burden countries are Bolivia, Argentina, and Brazil. Cardiac Chagas disease develops in approximately 20–30% of chronically infected individuals, typically emerging 10–20 years after initial infection, and is the leading cause of infectious cardiomyopathy in the region.\"\n",
      "source_date": "2024-09-01",
      "source_accessed": "2026-04-24",
      "calculation_notes": "The 20–30% cardiac involvement rate informs the severity framing: most people infected with T. cruzi do not die quickly — the disease progresses silently, which is why the gap between infection prevalence and recognized mortality is so wide. The endemic-country concentration supports the subgroup lifetime-risk estimate in the assumptions.\n"
    },
    {
      "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC9414802/",
      "title": "Global, Regional, and National Trends of Chagas Disease from 1990 to 2019 (GBD Study)",
      "publisher": "PLOS Neglected Tropical Diseases / PMC",
      "source_type": "primary_study",
      "statistic": "GBD 2019: Chagas responsible for 9,487 deaths globally; 275,377 DALYs; age-standardized death rate 0.12 per 100,000",
      "excerpt": "\"Chagas disease accounted for 9,487 deaths in 2019, compared to 11,235 in 1990, representing a 15.6% decrease. Total DALYs were 275,377 (95% UI = 184,453–459,354) in 2019. The age-standardized DALY rate was 3.34 (95% UI 2.25–5.57) per 100,000 population in 2019, a substantial decrease from 8.51 in 1990.\"\n",
      "source_date": "2022-08-01",
      "source_accessed": "2026-04-24",
      "archive_url": "http://web.archive.org/web/20260102043631/https://pmc.ncbi.nlm.nih.gov/articles/PMC9414802/",
      "calculation_notes": "GBD estimates (9,487/yr) are broadly consistent with WHO's figure of more than 10,000/yr. The WHO figure is used as the primary numerator since it aligns with surveillance data; the GBD figure cross-validates the order of magnitude (annual rate 9,487 / 5B ≈ 1.90 × 10⁻⁶, lifetime ≈ 0.000112).\n"
    }
  ],
  "comparison_anchors": [
    {
      "label": "Malaria death (global adult lifetime)",
      "lifetime_us_adult": 0.0042
    },
    {
      "label": "Typhoid death (global adult lifetime)",
      "lifetime_us_adult": 0.00129
    },
    {
      "label": "Lightning strike death (lifetime, US)",
      "lifetime_us_adult": 0.000013
    }
  ],
  "short_label": "Chagas disease",
  "myth_framing": "underrated",
  "outcome_severity": "fatal",
  "exposure_pattern": "cumulative",
  "outcome_type": "death",
  "valence": "negative",
  "caveats": "The global average (1 in 8,500 lifetime) obscures extreme geographic concentration: rural Bolivia, the Gran Chaco, and parts of Central America have infection prevalence 10–40× higher than the regional mean. Vector control programs have reduced transmission substantially in the Southern Cone since the 1990s, so people born after 1995 in many countries face lower transmission risk than older adults. Conversely, urbanization, climate change, and sylvatic spillover are expanding the triatomine range into previously unaffected areas. Blood-transfusion and vertical (mother-to-child) transmission now account for a growing share of new cases outside traditional endemic zones, including in North America and Europe via migration.\n",
  "quality_score": {
    "d1": 3,
    "d2": 5,
    "d3": 5,
    "d4": 4,
    "d5": 4,
    "d6": 4,
    "d7": 3,
    "d8": 5,
    "avg": 4.125,
    "scored_by": "extracted-from-transcript",
    "scored_at": "2026-05-03",
    "methodology_version": "1.0"
  },
  "reviewer": "8d-eval-2026-05-16",
  "last_reviewed": "2026-05-16",
  "reviewed": true,
  "generated_at": "2026-04-24",
  "image": {
    "alt": "Flat vector illustration of a triatomine bug silhouette on a cracked earth background, muted ochre and slate tones."
  },
  "attribution": "Likelier — https://likelier.app",
  "license": "https://creativecommons.org/licenses/by-sa/4.0/",
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}