Botulism: Entry Routes, Causes, Symptoms, and Prevention

Three Main Entry Routes

1. Foodborne (most common): Preformed botulinum toxin in improperly canned/preserved low-acid foods (home-canned vegetables, meats, fish; fermented Alaska Native foods; baked potatoes in foil; garlic-in-oil).
2. Wound botulism: C. botulinum spores contaminate wound → germinate in anaerobic tissue → produce toxin. Associated with injection drug use (black tar heroin), traumatic wounds.
3. Infant botulism (<1 year): Ingested spores (dust, soil, honey) colonize immature gut → in vivo toxin production. Honey is avoidable risk factor.

Clinical Syndrome (All Forms)

• Descending flaccid paralysis: cranial nerves first (diplopia, ptosis, dysphagia, dysarthria) → limbs → respiratory muscles.
• Autonomic: dry mouth, constipation, urinary retention, orthostatic hypotension.
• Sensory intact; cognition intact.

Treatment

• Antitoxin (heptavalent botulinum antitoxin – HBAT): Neutralizes circulating toxin; does not reverse bound toxin. Give ASAP.
• Supportive: Mechanical ventilation (often weeks-months), nutrition, DVT prophylaxis.
• Wound: Surgical debridement + antibiotics (penicillin/metronidazole).
• Infant: BabyBIG® (Botulism Immune Globulin Intravenous).

Prevention

• Pressure canning (116°C/240°F) for low-acid foods.
• Refrigerate garlic/herb oils; discard after 4 days.
• No honey <12 months.
• Wound care; harm reduction for injection drug use.