Botulism

Botulism results from botulinum neurotoxin, a potent substance made by Clostridium botulinum and, less often, related toxin-producing bacteria. The toxin acts on the nervous system and interferes with signals that activate muscles. Illness can begin with problems such as blurred or double vision, drooping eyelids, difficulty speaking or swallowing, and dry mouth. Weakness may progress downward through the body and affect the muscles used for breathing. The pattern and severity vary, and not every person experiences every symptom.

Foodborne botulism occurs when a person ingests toxin that has formed in contaminated food, often food that was inadequately processed or preserved. Wound botulism occurs when toxin-producing bacteria grow in a wound. In infant botulism, swallowed spores can germinate and produce toxin in an infant's intestine; rare adult intestinal cases also occur. Botulism can also follow excessive therapeutic or cosmetic botulinum-toxin exposure, while inhalational botulism is rare. These forms share the action of the toxin but differ in how it enters or is produced in the body.

Foodborne illness often begins with nerve-related symptoms and may also involve nausea, vomiting, abdominal discomfort or constipation. In infants, signs can include constipation, poor feeding, a weak cry and reduced muscle tone. Severe disease may paralyse breathing muscles. Clinicians assess symptoms, exposure history and neurological findings; laboratory tests can help confirm a case, but results may take time. Botulism is uncommon, and early symptoms can resemble other neurological conditions, so public-health and clinical guidance emphasizes prompt expert assessment when it is suspected.

Botulinum antitoxin is the specific treatment for botulism. Given early, it can neutralize toxin still circulating and help prevent additional harm, but it does not reverse damage that has already occurred. Patients may also need hospital care, including respiratory support or mechanical ventilation, while nerve and muscle function recover. Recovery can be prolonged. Clinical guidance recommends that treatment decisions for suspected cases not be delayed solely while awaiting laboratory confirmation.

Food-safety controls and correct processing of preserved foods reduce the risk of foodborne botulism. Infant botulism is associated with swallowed spores rather than preformed toxin in food; public-health guidance advises against giving honey to infants younger than 12 months. Botulism is not transmitted from one person to another. Suspected cases are important to public-health authorities because identifying a shared food source can help prevent additional illnesses.