Botulism
GMJ News knowledge hub · last reviewed August 2026 · Georgian Medical Journal
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Botulism — caused by the most potent biological toxin known (botulinum neurotoxin from Clostridium botulinum) — causes a dramatic descending flaccid paralysis from cranial nerves downward to respiratory muscles, potentially requiring weeks of mechanical ventilation while nerves slowly regenerate (WHO). Three main natural forms: foodborne botulism (from home-preserved or canned food containing pre-formed toxin — the classic outbreak form); wound botulism (from soil or injection drug use — a growing concern in people who inject drugs); and infant botulism (most common in the US — from ingesting C. botulinum spores in honey or soil). Modern ICU care has reduced case fatality from approximately 50% (pre-ICU era) to <5%.
Key messages
Most potent toxin known — 3 natural clinical forms
Botulinum toxin — produced by Clostridium botulinum — is the most potent biological toxin known (LD50 approximately 1-2 ng/kg). Three main natural forms: foodborne (pre-formed toxin in preserved foods); wound (PWID — injecting drug users); infant (most common in US, from honey/soil ingestion) (WHO).
Descending flaccid paralysis
Botulism causes a characteristic descending symmetrical flaccid paralysis: ptosis, diplopia, dysarthria, dysphagia → neck/arm weakness → respiratory failure. Sensory function and consciousness are preserved. The clinical pattern — descending, symmetric, afebrile — is pathognomonic.
Respiratory failure — weeks of ICU
The primary danger is respiratory failure from diaphragm and intercostal muscle paralysis — patients may require mechanical ventilation for weeks to months while nerve function slowly recovers (axon sprouting at the neuromuscular junction).
Antitoxin — early treatment is critical
Heptavalent botulinum antitoxin (HBAT — CDC Strategic National Stockpile in USA) binds circulating toxin but cannot reverse existing paralysis. It must be given as early as possible — before all toxin is bound to nerve terminals. Treatment is primarily supportive (ventilatory support).
Wound botulism rising in PWID
Wound botulism in people who inject drugs (PWID) — from contaminated heroin or black tar heroin inoculated into wounds — has increased dramatically in the UK, Germany and USA. Heroin contaminated with C. botulinum spores → wound infection → in situ toxin production.
Infant botulism — most common form in US
Infant botulism (the most common botulism form in the USA) occurs when C. botulinum spores (from honey, corn syrup, dust/soil) germinate in the infant gut and produce toxin in situ — causing floppy baby syndrome. Honey should never be given to infants <1 year.
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Food safetyPatient safetyHealth emergenciesICU carePWID wound botulismInfant botulism
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