Botulism history and symptoms
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Michael Maddaleni, B.S., Keanu Ngo[2]
Overview
Botulism classically produces an acute, afebrile, symmetric, descending flaccid paralysis that begins with cranial-nerve (oculobulbar) dysfunction in an alert patient with intact sensation. Adults typically present first with diplopia, blurred vision, ptosis, dysarthria, dysphonia, and dysphagia; weakness then descends to the trunk, limbs, and respiratory muscles. In foodborne disease, gastrointestinal symptoms (nausea, vomiting, abdominal pain, diarrhea) may precede or accompany the neurologic findings. Infants present with constipation, poor feeding/weak suck, weak cry, ptosis, loss of head control, and progressive hypotonia ("floppy baby"). Fever is characteristically absent; its presence suggests a superimposed infection.[1][2][3]
History
Key elements to elicit, tailored to the suspected form:[4][5]
- Time course: symptom onset 2 hours–8 days after exposure (peak ~48 hours) for foodborne; 4–14 days for wound; several days for infant.
- Dietary history: home-canned/preserved low-acid foods, fermented fish/marine mammal products, inadequately refrigerated cooked foods; honey in infants (though most infant cases are environmental).
- Injection drug use: black tar heroin, "skin popping" (subcutaneous/IM injection)—ask in any adult with descending weakness, even without an obvious wound.
- Symptom progression: descending pattern (eyes/bulbar → arms → trunk → legs) and any breathing or swallowing difficulty.
- Cluster/outbreak: shared meal or co-exposed persons with similar symptoms—clustering of symmetric descending paralysis strongly suggests botulism.
- Cosmetic/therapeutic botulinum toxin injection preceding weakness (iatrogenic).
Symptoms by clinical form
Adult (foodborne and wound)
In a large hospitalized series (86% foodborne), symmetric cranial-nerve palsies were often the initial symptom:[6][7]
- Ocular/visual: diplopia, blurred vision, ptosis, ophthalmoplegia.
- Bulbar: dysphagia, dysarthria, dysphonia, loss of facial expression, pooled secretions.
- Autonomic: dry mouth, dilated/poorly reactive pupils, ileus/constipation, urinary retention, orthostasis, heart-rate/blood-pressure lability.
- Motor: symmetric descending limb weakness; progression to dyspnea and neuromuscular respiratory failure (respiratory distress on admission in ~⅓ of cases).
- Gastrointestinal (foodborne): nausea, vomiting, abdominal pain, diarrhea—may precede or accompany neurologic signs. GI symptoms are typically absent in wound botulism.
- Sensation and consciousness are preserved.
- Deep tendon reflexes are typically diminished or absent, and sensation is preserved.[8]
Wound botulism shares the neurologic picture but lacks a GI prodrome; a history of injection drug use or contaminated wound, and failure to respond to naloxone, are important clues.[9][10]
Infant
Infant botulism occurs predominantly in infants younger than 6 months (range, 1 day–14 months; ~95% of confirmed cases before 6 months). It is preceded by or begins with constipation (often 3–24 days before hospitalization), followed by:[11][12]
- Poor feeding, weak/ineffective suck, excessive drooling.
- Weak cry, loss of facial expression.
- Ptosis, ocular palsies, diminished gag reflex.
- Loss of head control, progressive descending generalized weakness and hypotonia ("floppy baby").
- Progression to respiratory failure if untreated. Rapidly progressing infant botulism has been proposed as a cause of some sudden infant deaths.
Mildly affected infants may be managed as outpatients; constipation (~94%) and at least one cranial-nerve palsy (decreased head control, ptosis, weak cry, or poor suck; ~94%) are the most common features even in these milder cases.[13]
Clinically actionable points
- Recognize the pattern: afebrile, symmetric, descending paralysis starting with the eyes/bulbar muscles in an alert patient—do not wait for confirmatory testing to treat.[14]
- Ask about injection drug use in any adult with descending weakness and consider botulism when weakness fails to respond to naloxone.[15]
- In any hypotonic infant with constipation and poor feeding, consider infant botulism, even without honey exposure.[16]
- New fever should prompt evaluation for a superimposed infection, not attribution to botulism itself.[17]
References
- ↑ American Academy of Pediatrics (2024). Botulism and Infant Botulism (Clostridium botulinum). Red Book: 2024–2027 Report of the Committee on Infectious Diseases.
- ↑ Gayed SMA; Motley MP; Carlson JM; Lupu KS; Mavrogiorgos N (2026). "The Eyes Have It". The New England Journal of Medicine. 394 (10): 1011–1017. doi:10.1056/NEJMcps2508044.
- ↑ Boccagni C; Prestandrea C; D'Agostino T; et al. (2021). "Neurophysiological patterns of acute and post-acute foodborne botulism". Muscle & Nerve.
- ↑ Liu SC; Poon JT; Candee MS (2021). "Clinical Reasoning: A Teenager With Shortness of Breath and Difficulty Walking". Neurology.
- ↑ Schreck KC; Schneider L; Geocadin RG (2015). "Clinical Reasoning: A 44-Year-Old Woman With Rapidly Progressive Weakness and Ophthalmoplegia". Neurology.
- ↑ Gayed SMA; Motley MP; Carlson JM; Lupu KS; Mavrogiorgos N (2026). "The Eyes Have It". The New England Journal of Medicine. 394 (10): 1011–1017. doi:10.1056/NEJMcps2508044.
- ↑ Boccagni C; Prestandrea C; D'Agostino T; et al. (2021). "Neurophysiological patterns of acute and post-acute foodborne botulism". Muscle & Nerve.
- ↑ Liu SC; Poon JT; Candee MS (2021). "Clinical Reasoning: A Teenager With Shortness of Breath and Difficulty Walking". Neurology.
- ↑ Peak CM; Rosen H; Kamali A; et al. (2019). "Wound Botulism Outbreak Among Persons Who Use Black Tar Heroin—San Diego County, California, 2017-2018". MMWR. PMID 30605447.
- ↑ Kuehn B (2019). "Wound Botulism Outbreak". JAMA. 321 (6): 534. doi:10.1001/jama.2019.0006.
- ↑ American Academy of Pediatrics (2024). Botulism and Infant Botulism (Clostridium botulinum). Red Book: 2024–2027 Report of the Committee on Infectious Diseases.
- ↑ Dabritz HA; Chung CH; Read JS; Khouri JM (2025). "Global Occurrence of Infant Botulism: 2007–2021". Pediatrics. 155 (4): e2024068791. doi:10.1542/peds.2024-068791.
- ↑ Khouri JM; Dabritz HA; Payne JR; Read JS; Chung CH (2025). "Outpatient Infant Botulism in the United States, 1976-2021". The Journal of Pediatrics. PMID 39428092 Check
|pmid=value (help). - ↑ Kuehn BM (2021). "Botulism Guidelines Aim to Help Prepare Clinicians for Outbreaks". JAMA. 325 (24): 2428. doi:10.1001/jama.2021.8969.
- ↑ Kuehn B (2019). "Wound Botulism Outbreak". JAMA. 321 (6): 534. doi:10.1001/jama.2019.0006.
- ↑ Berkwitt A; El Saleeby CM; Murphy SA (2024). "Case 3-2024: An 8-Week-Old Male Infant with Inconsolable Crying and Weakness". The New England Journal of Medicine.
- ↑ Gayed SMA; Motley MP; Carlson JM; Lupu KS; Mavrogiorgos N (2026). "The Eyes Have It". The New England Journal of Medicine. 394 (10): 1011–1017. doi:10.1056/NEJMcps2508044.