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    1. Home
    2. Health and wellbeing
    3. Illnesses and conditions
    4. A to Z

    Botulism

    Botulism is a rare, life-threatening condition, where toxins attack the nervous system. If not treated quickly, paralysis can spread to the muscles controlling breathing. It can be fatal. Go to the nearest emergency department if you get any symptoms of paralysis.

    Symptoms of botulism

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

    These toxins attack the nervous system (nerves, brain and spinal cord) and cause paralysis (muscle weakness).

    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, some people have general symptoms to begin with, such as:

    • feeling sick and 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:

    • drooping eyelids
    • blurred or double vision
    • facial muscle weakness
    • difficulty swallowing
    • slurred speech
    • difficulty breathing

    Affected babies may also:

    • have a weak cry
    • find it difficult to feed
    • have a floppy head, neck and limbs

    When to get medical advice

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

    Go to your nearest emergency department or dial 999 for an ambulance straight away if you or someone you know has symptoms of the condition.

    Most people make a full recovery with treatment. 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
    • occasionally the human body

    There are three main types of botulism:

    • food-borne botulism – eating toxic food
    • wound botulism – infection from injecting contaminated illegal drugs, 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

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

    Treatment for botulism

    Botulism needs to be treated in hospital.

    How 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 Northern Ireland, the chances of getting food-borne botulism from food bought in this country is low.

    There's a slightly higher risk if you produce your own food, particularly if this involves canning.

    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
    • 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.

    The specific cause is not identified in many cases of infant botulism, so it may not always be possible to prevent it.

    You should avoid giving honey to babies less than 12 months old, because it has been known to contain Clostridium botulinum spores.

    These spores are harmless to older children and adults because the body develops defences against them from about one year of age,

    More useful links

    • Addiction NI
    • How to use your health services

    The information on this page has been adapted from original content from the NHS website.

    For further information see terms and conditions.

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