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Botulism

A rare medical emergency caused by botulinum neurotoxin, which attacks nerves and can lead to descending paralysis and respiratory failure.

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What causes Botulism?

Botulism is caused by botulinum neurotoxin, produced most often by Clostridium botulinum and sometimes by related bacteria. Illness can follow contaminated food, toxin production in a wound or intestine, or excessive or unsafe botulinum-toxin injection.

Symptoms and what to notice

Double or blurred vision, drooping eyelids, slurred speech, difficulty swallowing, dry mouth, facial weakness, and symmetric weakness that descends through the body. Infants may have constipation, poor feeding, a weak cry, floppiness, or breathing difficulty.

How long can it last?

Symptoms may begin within hours to days after exposure, depending on the form. Recovery often takes weeks to months because damaged nerve endings must regenerate, and some patients require prolonged ventilator support and rehabilitation.

How serious is Botulism?

Botulism can rapidly paralyze the muscles used for breathing and is always a medical emergency. Early antitoxin and careful respiratory support improve outcomes, but treatment must not wait for laboratory confirmation.

Treatment and management

Treatment includes prompt botulinum antitoxin and close respiratory monitoring. Adults and most children may receive Botulism Antitoxin Heptavalent (BAT); eligible infants with toxin type A or B may receive BabyBIG. Wound botulism may also require surgical debridement and antibiotics.

Vaccine: who and when?

No FDA-licensed human botulism vaccine is available for routine use in the United States. BAT and BabyBIG are antibody treatments used after illness is suspected; they are not vaccines. Prevention relies on safe food preservation, no honey before age one, wound care, and safe use of licensed medical products.

Cost note: No vaccine price applies because no routine human botulism vaccine is licensed. BAT and BabyBIG are emergency treatments arranged through public-health and specialist programs rather than routine retail vaccines.

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CDC Botulism guidance →

Patient cost varies by insurance, provider, location, and eligibility. Coverage and public-health access differ, so listed prices are examples rather than guaranteed patient prices. This page is for general education and does not replace individualized medical advice, diagnosis, vaccination assessment, or treatment.

Botulism: Causes, Symptoms, Treatment, Prevention, and Vaccine Information

Botulism is a rare but serious illness caused by botulinum neurotoxin, a toxin that attacks nerves and can paralyze the muscles used for seeing, speaking, swallowing, moving, and breathing. The toxin is produced most often by Clostridium botulinum and, less commonly, by related bacteria such as Clostridium baratii and Clostridium butyricum.

Botulism is a medical emergency. Paralysis usually begins with muscles controlled by the cranial nerves—the nerves involved in eye movement, facial expression, speech, and swallowing—and then descends through the body. A person may remain fully conscious and able to feel sensation while becoming progressively weaker. Without timely treatment and careful respiratory support, botulism can cause respiratory failure and death.

Five main forms affect people: foodborne, wound, infant, adult intestinal, and iatrogenic botulism. The source differs, but the neurological pattern is similar. Early antitoxin can stop unbound toxin from causing additional damage. It cannot reverse paralysis that has already occurred, so rapid recognition is critical.

Important: Botulism is an emergency. Double vision, drooping eyelids, slurred speech, difficulty swallowing, generalized weakness, or breathing difficulty—especially after eating preserved food, after an injection wound, or in a constipated, weak infant—requires immediate medical attention. Treatment should not wait for laboratory confirmation.

What Is Botulism?

Botulism is a neuroparalytic illness. The bacteria that produce botulinum toxin form spores, which are dormant structures that can survive for long periods in soil, dust, and aquatic sediments. Spores themselves commonly exist in the environment and usually do not harm older children or adults when swallowed.

The danger develops when spores encounter conditions that allow them to grow and produce toxin. These conditions may include:

Little or no oxygen.
Low acidity.
A suitable temperature.
Enough available water.
Insufficient salt or sugar to prevent bacterial growth.

Improperly canned, preserved, fermented, or stored foods can create this environment. The bacteria may also grow in a contaminated wound or in the intestines of a susceptible infant.

Botulinum neurotoxin blocks the release of acetylcholine, a chemical messenger used by nerves to activate muscles. When that signal is interrupted, muscles become weak or paralyzed. The autonomic nerves that control functions such as saliva production, pupil response, intestinal movement, and bladder function may also be affected.

Botulism Quick Facts

Feature	Information
Main cause	Botulinum neurotoxin
Main toxin-producing organism	Clostridium botulinum
Other possible organisms	C. baratii and C. butyricum
Main forms	Foodborne, wound, infant, adult intestinal, and iatrogenic
Characteristic pattern	Symmetric, descending flaccid paralysis beginning with cranial nerves
Sensation	Usually preserved
Person-to-person spread	No
Specific treatment	Botulinum antitoxin; BabyBIG® for eligible infants
Recovery	Often weeks to months
Routine vaccine	No FDA-licensed human botulism vaccine
U.S. reporting status	Nationally notifiable disease

The Five Main Types of Botulism

Foodborne Botulism

Foodborne botulism occurs when a person eats food containing preformed botulinum toxin. Improperly home-canned low-acid foods are a classic source, but outbreaks have also involved fermented foods, garlic or herbs stored in oil, foil-wrapped baked potatoes held at unsafe temperatures, canned cheese sauce, carrot juice, and prison-made alcohol known as pruno.

Commercial foods are rarely involved because regulated processing is designed to prevent toxin production, but commercial contamination can occur. A suspicious container must never be tasted to decide whether it is safe; even a tiny amount of toxin can cause severe illness.

Wound Botulism

Wound botulism occurs when spores contaminate a wound, germinate, and produce toxin inside the body. It has been strongly associated with injecting black tar heroin, especially by “skin popping” or injecting beneath the skin. Traumatic injuries and surgery can also create a risk.

The wound may look infected, but sometimes it does not. Neurological symptoms may appear even when there is little redness, swelling, or drainage.

Infant Botulism

Infant botulism occurs when spores enter an infant’s intestine, grow, and produce toxin. Infants younger than 12 months have an intestinal environment that may allow this colonization.

Honey is a recognized source of spores and must not be given to babies younger than one year. However, most infant cases are not linked to a specific food and cannot be completely prevented because spores also occur naturally in dust and soil.

Adult Intestinal Toxemia

Adult intestinal toxemia is rare. It resembles infant botulism: spores colonize the intestine and produce toxin there. It may occur in people with altered gastrointestinal anatomy, severe bowel disease, or disruption of normal intestinal bacteria.

Iatrogenic Botulism

Iatrogenic botulism can occur when too much botulinum toxin is injected for a medical or cosmetic procedure, when the product is counterfeit or mishandled, or when toxin spreads beyond the intended treatment area.

FDA-approved botulinum toxin products have legitimate uses and are generally safe when obtained from a licensed source and administered by a trained clinician at an appropriate dose. Symptoms of systemic toxin effect after an injection require immediate evaluation.

Is Botulism Contagious?

Botulism does not spread from person to person. A patient with botulism does not transmit the illness by coughing, touching, or sharing household space.

Several people can become ill at the same time if they eat the same contaminated food. That is a common-source exposure, not person-to-person transmission. Because one case may signal that contaminated food remains available, suspected foodborne botulism must be reported immediately to public-health authorities.

Incubation Period and Typical Duration

The time from exposure to symptoms varies by form and toxin dose.

Foodborne botulism often begins about 12 to 36 hours after contaminated food is eaten, although onset can be earlier or may take several days. Wound botulism generally develops more slowly because bacteria must grow and produce toxin inside the wound; symptoms may begin days to a couple of weeks after contamination. Infant botulism develops after intestinal colonization, so a single exposure date is often unknown.

Botulism itself can last a long time. Antitoxin neutralizes toxin still circulating in the blood but cannot detach toxin already bound to nerve endings. Recovery requires the body to form new nerve connections. This process commonly takes weeks to months.

Some patients need mechanical ventilation and hospital care for an extended period. Even after strength returns, fatigue, weakness, and shortness of breath can persist. Speech, physical, occupational, and respiratory therapy may be needed during recovery.

Early Symptoms of Botulism

Botulism usually produces prominent cranial-nerve problems before weakness reaches the arms, legs, and breathing muscles.

Early symptoms may include:

Double vision.
Blurred vision.
Drooping eyelids.
Difficulty focusing or moving the eyes.
Fixed or sluggish pupils.
Dry mouth.
Slurred or weak speech.
Difficulty swallowing.
A weak gag reflex.
Facial weakness.

Weakness then descends symmetrically through the neck, shoulders, arms, chest, and legs. The patient usually has no fever unless another infection is present. Sensation is generally normal, and the person may remain alert despite severe paralysis.

This combination—clear thinking, preserved sensation, cranial-nerve palsies, and descending symmetrical weakness—is a crucial diagnostic pattern.

Symptoms of Foodborne Botulism

Foodborne illness can begin with gastrointestinal symptoms before neurological findings appear. Possible symptoms include:

Nausea.
Vomiting.
Abdominal pain.
Diarrhea, sometimes followed by constipation.
Double or blurred vision.
Drooping eyelids.
Slurred speech.
Difficulty swallowing.
Generalized weakness.
Shortness of breath.

Not every person has gastrointestinal symptoms. The neurological pattern is more important than the presence or absence of vomiting or diarrhea.

If more than one person who shared a meal develops similar neurological symptoms, foodborne botulism should be considered immediately.

Symptoms of Wound Botulism

Wound botulism causes the same descending paralysis as foodborne botulism but may not produce nausea or abdominal symptoms.

Possible findings include:

Blurred or double vision.
Drooping eyelids.
Slurred speech.
Difficulty swallowing.
Facial weakness.
Weakness of the arms and legs.
Breathing difficulty.
Signs of an infected wound, such as redness, warmth, swelling, pain, or drainage.

A wound can produce toxin even if it looks minor or appears healed. Anyone who injects drugs and develops cranial-nerve symptoms or descending weakness needs emergency care.

Symptoms of Infant Botulism

Constipation is often the first sign in an infant, although it may be overlooked. Other symptoms can include:

Poor feeding.
A weak suck.
A weak or altered cry.
Reduced facial expression.
Drooping eyelids.
Sluggish pupils.
Loss of head control.
Floppiness or generalized weakness.
Reduced gag reflex.
Breathing difficulty.

Infant botulism is sometimes called “floppy baby syndrome,” but many other illnesses can also make an infant weak or floppy. Urgent evaluation is necessary.

How Serious Is Botulism?

Every form of botulism is potentially fatal because the breathing muscles can become paralyzed. Before modern intensive care and ventilation, death rates were extremely high.

Today, fewer than 5% of recognized U.S. patients die, according to CDC, but survival may require weeks or months of intensive care. Complications can include:

Respiratory failure.
Aspiration pneumonia.
Ventilator-associated pneumonia.
Blood clots caused by prolonged immobility.
Urinary infections.
Pressure injuries.
Malnutrition.
Anxiety, depression, or trauma associated with prolonged paralysis.

Early antitoxin and close respiratory monitoring reduce the chance that paralysis will progress to complete respiratory collapse.

How Is Botulism Diagnosed?

Initial diagnosis is clinical. A clinician evaluates the pattern of neurological findings and the exposure history. Because botulism is rare, it may initially be mistaken for:

Guillain-Barré syndrome.
Miller Fisher syndrome.
Myasthenia gravis.
Stroke.
Tick paralysis.
Certain poisonings.
Drug overdose.
Brainstem disorders.
Electrolyte or metabolic problems.

Routine blood tests and brain imaging may be normal. Those tests can help rule out other conditions but do not exclude botulism.

Laboratory confirmation may involve:

Detecting botulinum toxin in serum, stool, gastric fluid, or food.
Growing a toxin-producing Clostridium species from stool or a wound.
Testing suspected food during a public-health investigation.

Specialized public-health laboratories perform botulism testing. Results can take several days, so treatment must not be delayed while waiting.

In the United States, a clinician who suspects botulism should immediately call the state health department for consultation and antitoxin release. If necessary, public-health officials coordinate with CDC.

How Is Botulism Treated?

Antitoxin

Antitoxin is the only specific therapy for botulism. It binds toxin that is still circulating in the bloodstream and prevents it from attaching to additional nerve endings.

Antitoxin does not reverse paralysis that has already developed. The greatest benefit occurs when it is given early—ideally within the first day or two of illness—but a progressing patient may still benefit later because toxin can remain in circulation.

Botulism Antitoxin Heptavalent

Botulism Antitoxin Heptavalent (A, B, C, D, E, F, G), equine, commonly shortened to BAT, is the U.S. antitoxin for symptomatic botulism in adults and in children who are not treated with the infant-specific product. It provides antibodies against seven botulinum toxin types.

BAT is held within government supplies and released through public-health authorities. It is not a retail drug. Because it is derived from horse antibodies, clinicians monitor for allergic reactions and other infusion-related effects.

BabyBIG®

Proper name: Botulism Immune Globulin Intravenous (Human), also called BIG-IV Trade name: BabyBIG®

BabyBIG is FDA-approved to treat infant botulism caused by toxin types A or B in patients younger than one year. It is made from human antibodies and is obtained through the California Department of Public Health’s Infant Botulism Treatment and Prevention Program.

BabyBIG can shorten hospital stays and reduce complications when given early. Like other antitoxin therapy, it neutralizes circulating toxin rather than reversing nerve damage that has already occurred.

Respiratory and Intensive Care

Breathing can deteriorate quickly, sometimes before a patient reports severe shortness of breath. Clinicians monitor respiratory muscle strength and airway protection closely.

Treatment may include:

Admission to an intensive-care unit.
A breathing tube and mechanical ventilation.
Nutrition through a feeding tube when swallowing is unsafe.
Prevention of blood clots and pressure injuries.
Treatment of secondary infections.
Speech, physical, occupational, and respiratory therapy.

Wound Care and Antibiotics

Wound botulism may require surgical cleaning or debridement to remove toxin-producing bacteria and damaged tissue. Antibiotics are used for the wound infection when appropriate.

Antibiotics are not routinely useful for foodborne botulism because the illness is caused by toxin already present in food. In infant intestinal botulism, antibiotics are generally avoided unless needed for another infection because killing bacteria in the intestine could theoretically release additional toxin.

Recovery and Long-Term Effects

Recovery begins when nerve endings regenerate and form new connections with muscles. Strength usually returns gradually, often in the reverse order of the original paralysis.

Recovery may involve:

Prolonged ventilator support.
Rehabilitation for walking, swallowing, and daily activities.
Speech therapy.
Management of fatigue and shortness of breath.
Psychological support after a frightening prolonged illness.

Most survivors eventually recover substantial or complete function, but the process can take months. CDC notes that some people report fatigue and breathing limitations for years.

Is There a Botulism Vaccine?

No FDA-licensed vaccine is available for routine prevention of human botulism in the United States. There is no childhood, adult, travel, occupational, or pharmacy vaccine that the general public can receive.

Experimental botulinum toxoid vaccines have been studied and have occasionally been used under investigational protocols for small groups with exceptional laboratory or military risks. These products are not licensed for routine use and are not generally available.

This distinction is important:

BAT is an antitoxin used after symptoms begin; it is not a vaccine.
BabyBIG is an immune-globulin treatment for eligible infants; it is not a vaccine.
FDA-approved cosmetic and therapeutic botulinum-toxin injections are medicines, not vaccines.

Because no routine vaccine exists, prevention depends on safe food preparation, wound care, avoiding injection-drug exposure, protecting infants from honey, and using licensed botulinum-toxin products correctly.

Vaccine Name and Cost

There is no licensed human botulism vaccine name or routine consumer price in the United States. Any website or clinic advertising a routine botulism vaccine to the public should be treated with caution and verified with a state health department or CDC.

Preventing Foodborne Botulism

Use Safe Canning Methods

Low-acid foods—such as vegetables, meats, poultry, fish, seafood, and some tomato products—must be processed using tested pressure-canning instructions. A boiling-water canner does not reach a high enough temperature to reliably destroy botulism spores in low-acid foods.

Use recipes and processing times from USDA, the National Center for Home Food Preservation, or a recognized cooperative extension program. Do not improvise jar sizes, ingredients, acidity, pressure, or processing time.

Reject Suspicious Containers

Never eat or taste food from a container that is:

Bulging, swollen, leaking, or cracked.
Spurting liquid or foam when opened.
Badly damaged or unusually pressurized.
Abnormal in appearance or odor.

Botulinum toxin cannot reliably be seen, smelled, or tasted. A container can be dangerous even when the food appears normal. “When in doubt, throw it out” is the safest rule.

Store Foods Correctly

Refrigerate opened canned or pickled foods.
Refrigerate homemade oils containing garlic or herbs and discard them according to current guidance.
Keep foil-wrapped baked potatoes hot until served or refrigerate them promptly with the foil loosened.
Refrigerate perishable foods promptly.
Avoid homemade prison alcohol such as pruno.
Follow current safety instructions for traditional fermented fish or marine-animal foods.

CDC advises boiling certain home-canned or home-fermented foods for 10 minutes before eating, adding one minute for every additional 1,000 feet of elevation. This step does not make a known improperly processed food safe; such food should be discarded without tasting.

Preventing Infant Botulism

Do not give honey to a child younger than 12 months.
Do not add honey to infant food, water, formula, or pacifiers.
Do not use honey-filled or honey-coated pacifiers for infants.

Cooking or pasteurizing honey is not a dependable way to make it safe for infants. Honey becomes acceptable after the first birthday because the intestinal environment matures.

Most infant botulism cannot be traced to a preventable source. Routine household cleaning cannot eliminate environmental spores, and parents should not blame themselves when a case occurs.

Preventing Wound and Iatrogenic Botulism

Do not inject illicit drugs, particularly black tar heroin.
Seek care promptly for a red, swollen, warm, painful, or draining wound.
Remember that wound botulism can occur even when the wound looks minor.
Obtain cosmetic or therapeutic botulinum-toxin injections only from a licensed, qualified clinician using an FDA-approved product from an authorized source.
Do not purchase injectable toxin products online or attend unlicensed injection events.
Report neurological symptoms promptly after an injection.

When to Seek Emergency Care

Call emergency services or go to an emergency department immediately for:

Double vision or sudden blurred vision.
Drooping eyelids.
Slurred speech.
Difficulty swallowing or controlling saliva.
Facial weakness followed by arm or leg weakness.
Shortness of breath or shallow breathing.
Weakness after eating home-canned, fermented, or preserved food.
Weakness after an injection wound or botulinum-toxin procedure.
An infant with constipation, poor feeding, weak cry, floppiness, or breathing difficulty.

Do not wait for multiple symptoms to appear. Early symptoms can be mild even while paralysis is progressing.

If a food is suspected, keep other people from eating it and contact public-health authorities. Do not transport leaking or swollen containers unless instructed; public-health officials can advise on safe handling and testing.

Frequently Asked Questions About Botulism

Can botulism spread between people?

No. Botulism is not contagious. Several people can become ill from a shared contaminated food, but they do not infect one another.

Can I tell whether food contains botulinum toxin?

Not reliably. The toxin cannot necessarily be seen, smelled, or tasted. Never taste suspicious food as a safety test.

Does boiling destroy botulinum toxin?

The toxin is heat-sensitive, but spores are highly heat-resistant. CDC and USDA provide specific boiling advice for certain home-processed foods, while safe pressure canning is required to control spores in low-acid foods. Boiling cannot rescue food known to have been dangerously processed or stored.

Why does paralysis take so long to improve?

Botulinum toxin binds strongly to nerve endings. Antitoxin prevents additional binding but cannot remove toxin already attached. The body must grow new nerve connections, which takes weeks or months.

Is BabyBIG a vaccine?

No. BabyBIG is human botulism immune globulin used to treat infants younger than one year with botulism caused by toxin types A or B.

Is BAT a vaccine?

No. Botulism Antitoxin Heptavalent is an equine-derived antibody treatment for symptomatic botulism. It is distributed through public-health authorities.

Is there a vaccine for botulism?

There is no FDA-licensed routine human botulism vaccine in the United States. Investigational toxoid vaccines are not generally available.

Can adults get intestinal botulism?

Yes, but it is very rare. It may occur when an adult’s intestinal anatomy or normal bacterial population has been altered enough to allow toxin-producing bacteria to colonize.

Can licensed cosmetic injections cause botulism?

Systemic botulinum-toxin effects are uncommon when an authentic FDA-approved product is used correctly. Risk rises with excessive dosing, counterfeit products, unlicensed sources, or improper administration. Symptoms such as swallowing difficulty, generalized weakness, or breathing trouble require emergency care.

How quickly should antitoxin be given?

As soon as botulism is clinically suspected and public-health consultation supports treatment. Clinicians should not wait for laboratory confirmation.

The Main Takeaway

Botulism is caused by a powerful neurotoxin that produces symmetric, descending paralysis. It can come from contaminated food, a wound, intestinal colonization in an infant or susceptible adult, or excessive or unsafe botulinum-toxin injection. It is not contagious.

Antitoxin can stop additional nerve damage, but it cannot reverse paralysis already present. Early recognition, immediate public-health consultation, respiratory support, and appropriate antitoxin are the keys to survival. No routine human vaccine is licensed in the United States, so prevention centers on safe canning and food storage, no honey before age one, prompt wound care, avoidance of injection-drug risks, and use of authentic medical products from licensed professionals.

Information reviewed against CDC, FDA, and USDA guidance available through September 2026.

Botulism: Symptoms, Treatment & Vaccine Guide