{
  "slug": "bee-sting-anaphylaxis-epipen",
  "question": "What are the odds that a bee or wasp sting will trigger anaphylactic shock requiring an epinephrine injection?",
  "category": "animal",
  "no_reliable_estimate": false,
  "perceived": {
    "description": "Anaphylaxis from a sting has an unusual perception profile: people who carry an epinephrine auto-injector know their precise risk and tend to hold it accurately, while most people who have never reacted assume their lifetime \"been stung before, was fine\" record makes them essentially safe. The evidence does not support that second reading: roughly half of all fatal sting reactions in the US occur in people with no prior history of a systemic allergic response.\n",
    "rough_estimate": "non-allergic adults tend to guess near-zero personal risk; the actual lifetime rate is roughly 1 in 50 for severe reactions",
    "kind": "intuition"
  },
  "native": {
    "display": "~3% of US adults report a systemic allergic reaction to a sting in their lifetime",
    "numerator": 7800000,
    "denominator": 260000000,
    "unit": "lifetime prevalence",
    "population": "US adults"
  },
  "normalized": {
    "lifetime_us_adult": 0.02,
    "display": "~1 in 50 lifetime (US adult)",
    "log_value": -1.7,
    "assumptions": "Golden (Immunology and Allergy Clinics of North America, 2007, PMC1961691) and the ACAAI both report that systemic allergic reactions to stings occur in approximately 3% of US adults over their lifetime. The 3% figure (≈7.8M of 260M adults) is the widest defensible numerator — it includes urticaria-only systemic responses in addition to full cardiovascular or respiratory anaphylaxis. The sub-fraction that meets the stricter clinical definition of anaphylaxis (Grade III–IV Müller: hypotension, bronchospasm, or loss of consciousness, requiring epinephrine) is approximately two-thirds of adult systemic reactions, yielding a lifetime probability of roughly 2% (~1 in 50). The normalized value of 0.02 is used because the question specifically asks about epinephrine-requiring anaphylaxis rather than urticaria-only reactions. Uncertainty bounds bracket the full 3% ceiling and a conservative 1% floor corresponding to diagnosed venom allergy prevalence.\n",
    "uncertainty": {
      "low": 0.01,
      "high": 0.04
    },
    "scope": "us_adult_lifetime"
  },
  "sources": [
    {
      "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC1961691/",
      "title": "Insect Sting Anaphylaxis",
      "publisher": "Immunology and Allergy Clinics of North America (Golden DBK) / PubMed Central",
      "source_type": "peer_reviewed",
      "statistic": "Systemic allergic reactions reported by up to 3% of US adults; ≥50 fatal sting reactions per year; ~half of fatal reactions occur with no prior history",
      "excerpt": "\"Systemic allergic reactions are reported by up to 3% of adults, and almost 1% of children have a medical history of severe sting reactions … At least 50 fatal sting reactions occur each year in the United States … Half of all fatal reactions occur with no history of previous sting reactions.\"\n",
      "source_date": "2007-05-01",
      "source_accessed": "2026-05-04",
      "archive_url": "http://web.archive.org/web/20260505050018/https://pmc.ncbi.nlm.nih.gov/articles/PMC1961691/",
      "calculation_notes": "Primary source for the 3% lifetime systemic reaction prevalence. The normalized value of 0.02 uses the ~2/3 severe-within-systemic fraction (Grade III–IV, epi-requiring) to arrive at a ~2% lifetime probability.\n",
      "independence_note": "Draws from clinical allergy and venom-IgE serology literature, independent of death-certificate or NEISS ED-visit data streams.\n"
    },
    {
      "url": "https://www.aafp.org/pubs/afp/issues/2003/0615/p2541.html",
      "title": "Stinging Insect Allergy",
      "publisher": "American Academy of Family Physicians / American Family Physician",
      "source_type": "reputable_reference",
      "statistic": "1–3% of adults experience systemic reactions to insect stings; ~220,000 sting allergic reaction ED visits per year in the US",
      "excerpt": "\"Between 1 and 3 percent of the general population has a history of systemic allergic reactions to insect stings … In the United States, approximately 220,000 emergency department visits occur annually for insect sting allergic reactions … The mortality rate is estimated at 40 deaths per year, but this is likely an underestimate.\"\n",
      "source_date": "2003-06-15",
      "source_accessed": "2026-05-04",
      "archive_url": "http://web.archive.org/web/20260312173837/https://www.aafp.org/pubs/afp/issues/2003/0615/p2541.html",
      "calculation_notes": "Corroborates the 1–3% lifetime systemic reaction range and provides the 220,000/year ED visit baseline. The annual visit rate cross-checks the lifetime prevalence: 220,000 / 335,000,000 ≈ 6.6 × 10^-4/year, compounded over 59 years ≈ 3.8% — consistent with the top of the 3% lifetime range when ED-seeking behavior is factored in.\n",
      "independence_note": "AAFP review drawing on epidemiological literature independent of the Golden 2007 PMC source above.\n"
    }
  ],
  "comparison_anchors": [
    {
      "label": "Oropharyngeal sting ER visit from swallowed insect (lifetime, US adult)",
      "lifetime_us_adult": 0.002
    },
    {
      "label": "Death by bee/wasp sting (any route, lifetime, US adult)",
      "lifetime_us_adult": 0.0001267
    },
    {
      "label": "Developing a food allergy as an adult (lifetime, US adult)",
      "lifetime_us_adult": 0.045
    }
  ],
  "personal_factor_multipliers": [
    {
      "factor": "prior systemic sting reaction",
      "multiplier": 10,
      "notes": "Golden 2007: 25–70% of those with prior anaphylaxis will react again on re-sting"
    },
    {
      "factor": "carries epinephrine auto-injector and uses promptly",
      "multiplier": 0.02,
      "notes": "timely epinephrine reduces case fatality by ~90%; prompt treatment also shortens systemic reaction"
    },
    {
      "factor": "completed venom immunotherapy (VIT)",
      "multiplier": 0.05,
      "notes": "VIT reduces systemic reaction risk by 95% in treated patients"
    },
    {
      "factor": "no prior systemic reaction, single family home/suburban outdoor exposure",
      "multiplier": 1,
      "notes": "baseline population estimate applies"
    }
  ],
  "short_label": "Sting anaphylaxis",
  "outcome_severity": "serious_harm",
  "exposure_pattern": "acute",
  "outcome_type": "recoverable_injury",
  "valence": "negative",
  "caveats": "The 3% lifetime figure covers all systemic sting reactions in US adults, including milder urticaria-only episodes that may not require epinephrine. Strict cardiovascular/respiratory anaphylaxis (the scenario where an epi-pen is genuinely life-saving) is a sub-fraction, estimated here at ~2% lifetime. Risk is highly non-uniform: individuals with prior systemic reactions face a 25–70% chance of reacting again on re-sting, while those who have completed venom immunotherapy reduce their risk by ~95%. Notably, roughly half of all fatal sting reactions in the US occur in people with no prior history of systemic allergy — so a lifetime \"never had a bad reaction\" record does not eliminate risk, it just shifts one into the lower-risk portion of the population distribution.\n",
  "quality_score": {
    "d1": 4,
    "d2": 5,
    "d3": 4,
    "d4": 4,
    "d5": 4,
    "d6": 4,
    "d7": 4,
    "d8": 5,
    "avg": 4.25,
    "scored_by": "claude-code-8d",
    "scored_at": "2026-05-25",
    "methodology_version": "1.2"
  },
  "reviewer": "8d-eval-2026-05-16",
  "last_reviewed": "2026-05-16",
  "reviewed": true,
  "generated_at": "2026-05-04",
  "image": {
    "alt": "A stylized epinephrine auto-injector beside a wasp silhouette, flat vector editorial illustration."
  },
  "attribution": "Likelier — https://likelier.app",
  "license": "https://creativecommons.org/licenses/by-sa/4.0/",
  "support": "https://buymeacoffee.com/kgluszczyk?via=likelier&utm_content=api-fear-single",
  "canonical_url": "https://likelier.app/bee-sting-anaphylaxis-epipen"
}