Botulism is a very rare but life-threatening condition caused by toxins produced by Clostridium botulinum bacteria.

These toxins are some of?the most powerful known to science. They attack the nervous system (nerves, brain and spinal cord) and cause paralysis (muscle weakness).

Most people will make a full recovery with treatment, but the paralysis can spread to the?muscles that?control breathing if it's not treated quickly. This?is fatal in around 5-10% of cases.

This page covers:

Symptoms of botulism

When to get medical advice

Causes and types of botulism

Treatment for botulism

Preventing botulism

Symptoms of botulism

The time it takes to develop symptoms can vary from a few hours to several days after exposure?to the Clostridium botulinum bacteria or their toxins.

Depending on the exact type of the condition (see?Causes and types of botulism below),?some people?initially have symptoms such as?feeling sick, vomiting,?stomach cramps, diarrhoea or constipation.

Without treatment,?botulism?eventually causes paralysis that?spreads down the body from the head to the legs. Symptoms can include:

Affected babies may also have a weak cry, find it difficult to feed and have a floppy head, neck?and?limbs.

When?to get medical advice

Botulism is a very serious condition that requires immediate medical attention.

Go to?your nearest accident and emergency (A&E) department or dial 999 for an ambulance?straight away?if you or someone you know has symptoms of the condition.

Treatment is more?effective the earlier it's started.

Causes and types of botulism

Clostridium botulinum bacteria are found in soil, dust, and river or sea sediments. The bacteria themselves aren't harmful, but they can produce highly poisonous toxins when deprived of oxygen?? such as in closed cans or bottles, stagnant soil or mud, or occasionally the human body.

There are three main types of botulism:

  • food-borne botulism???when someone eats food containing the toxins because it hasn't been properly canned, preserved or cooked
  • wound botulism???when a wound becomes infected with the bacteria, usually as a result of injecting illegal drugs contaminated with the bacteria, such as heroin, into muscle rather than a vein
  • infant botulism???when a baby swallows?a resistant form of the bacteria, called a spore, in?contaminated soil or?food, such as honey. These?spores are harmless to older children and adults because the body develops defences against them from about one year of age

All these types of botulism are very rare in the UK, but occasional cases do occur.

Treatment for botulism

Botulism needs to be treated in hospital.

The?way?it's treated depends on?which?type of botulism you have, but treatment will usually involve:

  • neutralising the toxins with injections of special antitoxins or antibodies
  • supporting the functions of the body, such as breathing, until you recover

Treatment?won't reverse any paralysis that's already been caused by the toxin, but it will stop it getting any worse.

In most people, paralysis that occurred before treatment will gradually improve over?the following weeks or months.

Preventing botulism

As a result of?high standards of food hygiene in the UK, the chances of getting food-borne botulism from food bought in this country are tiny.

There's a slightly higher risk if you produce your own food, particularly if this involves canning. However, following food hygiene procedures and canning recommendations will reduce any risk.

You should also avoid?eating food from visibly bulging or damaged cans, foul-smelling preserved foods, foods stored at the incorrect temperature and out of date foods.

Heroin users should?avoid injecting heroin into?their muscles. Injecting heroin?into a vein or smoking it can reduce the risk of botulism, although not using heroin at all is by far?the best course of action. Read more about getting help to stop using heroin.

The specific cause is not identified?in?many cases of infant botulism, so it may not always be possible to prevent it. However, you should avoid giving honey to?babies?less than 12 months old?because it has been known to contain?Clostridium botulinum?spores.?

Page last reviewed: 18/02/2016

Next review due: 18/02/2018