Infezione meningococcica

Meningococcal infection is one of the most common causes of bacterial meningitis. If you suspect meningite o sepsi -get medical help immediately by calling for an emergency ambulance (999 in the UK).

What is meningococcal infection?

Meningococcal infection refers to any illness caused by a germ (bacterium) called Neisseria meningitidis.

Neisseria meningitidis (meningococcus) is common, living harmlessly in the nose and throat of about 1 in 4 people. However, rarely, meningococcus can spread and cause severe infection. This is called invasive meningococcal disease.

Meningococcal diseases include infections of the lining of the brain and spinal cord (meningite), and of the bloodstream and blood vessels (sepsi).

Meningococcal germs (bacteria) are divided into several groups (types or strains):

• Groups B, C and, more recently, W are the common strains in the UK. Most cases of bacterial meningite in the UK are caused by group B. Most of the rest are caused by group C (although the number of group C cases has fallen greatly due to immunisation introduced in 1999). Infection caused by group W has increased in the UK in recent years.

• Group A is rare in the UK but more common in certain parts of the world - in particular, sub-Saharan Africa and parts of Saudi Arabia.

• Groups Y, 29E and Z are rare in the UK but group W has been the cause of several recent outbreaks in different parts of the world, including the UK.

Meningococcal infection is very rare. There were 525 cases of meningococcal disease (IMD) in England in 2018/19 compared with 754 cases in 2017/18.. About 2,500 people in the UK have bacterial meningitis each year.

It can affect anyone, at any age. However, children under the age of 5 years (especially babies) are the most at risk. The second most common age group at risk is teenagers aged 15 to 19.

Meningococcal germs (bacteria) live harmlessly in the noses and throats of about 1 in 4 people. These people are called carriers. Meningococcal bacteria do not survive outside the body. Close contact is needed to pass them on to others, such as intimate kissing, coughing, or sneezing near to others.

Rarely, this germ (bacterium) overcomes the body's immune system and gets into the blood to cause meningitis and/or blood poisoning (septicaemia). It is not clear why a few people are prone to serious illness and many other people are carriers of the same bacterium but experience no ill effects.

Most cases of meningococcal infection are isolated cases. The risk of others catching it are low, as many people are carriers and/or have natural immunity. Sometimes small outbreaks occur when two or more people in the same household or community are affected.

One or more of the following symptoms may occur:

Nota: not all symptoms may occur. For example, the classic symptoms of neck stiffness and rash may not occur. If you suspect meningitis or septicaemia - call for an emergency ambulance immediately (999 in the UK).

Sintomi comuni di allarme precoce

Many children who are developing meningitis or septicaemia have nonspecific symptoms such as just feeling or looking generally unwell. These symptoms may include having a alta temperatura (febbre), being more tired than usual and feeling sick.

Tuttavia, tre sintomi che si sviluppano comunemente in anticipo - spesso prima dei sintomi più classici elencati successivamente - sono:

• Leg pains. The pains can become severe and prevent a child from standing or walking.

• Mani o piedi freddi - anche se il bambino ha la febbre alta.

• Colore pallido, scuro o blu della pelle intorno alle labbra.

Rash - commonly occurs, but not always

A typical rash is common with meningococcal infection. The rash is red or purple.

Small spots develop at first and may occur in groups anywhere on the body. They often grow to become blotchy and look like little bruises. One or two may develop at first but many may then appear in different parts of the body. The rash can be hard to see on dark skin. Check paler areas like the palms of the hands and the soles of the feet.

The spots/blotches do not fade when pressed (unlike many other rashes). To check for this, do the glass test. Place a clear glass firmly on one of the spots or blotches. If the spot/blotch does not fade and you can still see it through the glass, get medical help immediately.

The rash is a sign of sepsi. It may not occur with meningitis alone.

Other symptoms to look out for include the following.

Altri sintomi che possono verificarsi nei neonati

• Piantare eccessivo - spesso acuto o lamentoso e diverso dal loro pianto abituale.

• Fast breathing, or unusual patterns of breathing.

• Fever - but the baby may not look hot and the skin may look pale or blotchy, or turn blue. The hands and feet may feel cold. The baby may shiver.

• Non accetta il cibo - a volte vomita ripetutamente.

• Essere irritabile - soprattutto quando viene preso e maneggiato.

• Drowsiness or sleepiness - does not wake easily.

• A bulging fontanelle sometimes develops. The fontanelle is the soft spot on the baby's head.

• Jerky movements may occur and the body may appear stiff. Sometimes the opposite occurs and the body appears quite floppy. Fits or seizures (convulsions) sometimes develop.

Altri sintomi che possono verificarsi nei bambini più grandi e negli adulti

Questi includono:

• Febbre e brividi - tuttavia, le mani e i piedi spesso si sentono freddi.

• Stiff neck - cannot bend the neck forwards.

• Mal di testa - che può diventare grave.

• Respiro rapido.

• Dolori e fastidi nei muscoli o nelle articolazioni - i dolori possono diventare piuttosto intensi.

• La pelle può apparire pallida o chiazzata, o diventare blu.

• Avversione per le luci intense - chiuderà gli occhi e si allontanerà dalla luce.

• Sonnolenza o confusione - può apparire assente.

• Repeated vomiting. Sometimes tummy (abdominal) pain and diarrhoea.

How quickly do symptoms develop?

The symptoms usually develop quickly, over a few hours or so. Symptoms can occur in any order and not all may occur. Sometimes symptoms develop more slowly, over a few days.

The symptoms may suggest a less serious illness at first. For example, fever, headaches and vomiting are common with many viral illnesses such as flu. Therefore, even if you think it was flu to start with, if symptoms become worse then it may be meningitis or septicaemia. See also the separate leaflet called Meningitis symptoms checklist.

If you suspect meningitis or septicaemia - call an emergency ambulance immediately (999 in the UK).

• Meningitis is an inflammation of the lining that covers the brain and spinal cord (the meninges). Bacterial or viral infection is the usual cause. Bacterial meningitis is uncommon but serious. Viral meningitis is quite common but much less serious than a bacterial cause.

• Septicaemia is an infection of the blood with bacteria. It is often called 'blood poisoning'. If bacteria multiply and release poisons (toxins) into the blood it can cause serious illness and death.

Meningococcus typically causes meningitis and sepsi allo stesso tempo.

Treatment for meningococcal infection include the following:

Antibiotic injection

Antibiotic injections are needed urgently. High doses are usually given. The person will need admitting to hospital - if they are very unwell then they will go to a high dependency or intensive care ward, as the infection often causes shock and problems throughout the body.

Spinal tap (lumbar puncture)

In an ideal world a spinal tap (lumbar puncture) would be done before treating, so that some fluid from the spinal cord (cerebrospinal fluid) can be sent to the lab to try to grow the germ (bacterium), but often the need for antibiotics is so urgent that these are given first.

Immunizzazione

Children are routinely immunised against certain causes of meningitis. These include Haemophilus influenzae type B (Hib), group C meningococcus, pneumococcus and mumps. Immunisation against group B meningococcus (MenB®) was introduced in September 2015.

From August 2015 a vaccine against types A, C, W and Y (MenACWY®) is given to all those aged 17-18 and new university/college students under 25. It will also be given to those aged 14-15 in place of the meningitis C vaccine they currently receive. Other vaccines may be used for travellers going to meningitis-prone countries.

Vaccines are not yet available for other causes of meningitis.

Leggi di più su meningococcal immunisation.

Close contacts

Close contacts of a person with meningococcal infection have an increased risk of developing the illness. However, the risk is still low. 'Close contacts' usually means household members or intimate kissing contacts within the previous seven days. These people are offered a short course of antibiotics to prevent possible infection.

If group C meningococcus is the cause, immunisation is usually also offered to close contacts. Occasionally, an outbreak of two or more cases of meningococcal infection occurs in the same school, college or similar community. Antibiotics and/or immunisation may then be offered to a wider group of people.

The outlook (prognosis) often depends on how soon antibiotics are given after the illness starts. Most people make a good recovery if treated early enough. However, without treatment, most people will die.

A difficulty is that meningococcal infection can develop very quickly and can mimic other illnesses when symptoms first begin. Treatment may be delayed if the cause of early symptoms is not clear at first. In some cases a person can be well in the morning, develop flu-like symptoms by the afternoon and be critically ill or dead by the evening.

According to the National Institute for Health and Care Excellence (NICE), in the UK 4-25% of children and 25% of adults with acute bacterial meningitis will die. Of those who survive, some are left with some permanent brain damage, deafness or amputation of one or more limbs. Death rates may be higher if septicaemia occurs.