What is meningococcal disease?
- Meningococcal disease is a serious illness that usually causes meningitis (inflammation of the lining of the brain and spinal cord) and/or septicaemia (blood poisoning). Rare forms of the disease include septic arthritis (joint infection), pneumonia (lung infection) and conjunctivitis (infection of the outer lining of the eye and eyelid).
- People with meningococcal disease can become extremely unwell very quickly. Five to ten per cent of patients with meningococcal disease die, even despite rapid treatment.
- The disease has become less common in recent years with fewer than 50 cases now seen each year in NSW.
- Historically winter and spring have been the peak seasons for meningococcal disease, however cases can occur year round.
- Meningococcal disease is caused by infection with Neisseria meningitidis of which there are several serogroups. In NSW, the most common form is serogroup B. Disease is also caused by serogroups A, C, W and Y. The meningococcal C vaccine has reduced the number of cases caused by that serogroup.
- Between 5 and 25 per cent of people carry meningococcal bacteria at the back of the nose and throat without showing any illness or symptoms.
What are the symptoms?
- Symptoms of meningococcal disease are non-specific but may include sudden onset of fever, headache, neck stiffness, joint pain, a rash of red-purple spots or bruises, dislike of bright lights nausea and vomiting.
- Not all of the symptoms may be present at once.
- Young children may have less specific symptoms. These may include irritability, difficulty waking, high-pitched crying, and refusal to eat.
- The typical meningococcal rash doesn't disappear with gentle pressure on the skin. Not all people with meningococcal disease get a rash or the rash may occur late in the disease.
- Sometimes the classic symptoms may follow less specific symptoms including leg pain, cold hands and abnormal skin colour.
- Meningococcal disease can sometimes follow on from other respiratory infections.
- People who have symptoms of meningococcal disease should see a doctor urgently, especially if there is persistent fever, irritability, drowsiness or lethargy, or a child is not feeding normally.
How is it spread?
- Meningococcal bacteria are not easily spread from person to person and the bacteria do not survive well outside the human body.
- The bacteria are passed between people in the secretions from the back of the nose and throat. This generally requires close and prolonged contact with a person carrying the bacteria who is usually completely well. An example of 'close and prolonged contact' is living in the same household or intimate (deep) kissing.
- Meningococcal bacteria are not easily spread by sharing drinks, food or cigarettes.
Who is at risk?
While the disease can affect anyone, those at higher risk include:
- household contacts of patients with meningococcal disease
- infants, small children, adolescents and young adults
- people who are exposed to cigarette smoke and people who are exposed to smokers
- people who practice intimate (deep mouth) kissing with more than one partner
- people who have recently had a viral upper respiratory tract illness
- travellers to countries with high rates of meningococcal disease
- people with no working spleen or who have certain other rare medical conditions.
People who have had only minor exposure to someone with meningococcal disease have a very low risk of developing the disease. Healthcare workers are not at increased risk unless they have been directly exposed to a case's nasopharyngeal secretions (for example, if they performed mouth-to-mouth resuscitation or intubated the case without using a face mask).
How is it prevented?
Several vaccines against meningococcal disease are available in Australia.
Vaccination against meningococcal C is included in the national Immunisation Program Schedule. It is recommended for all children at one year of age (as part of free routine immunisation).
A vaccine against some serogroup B strains has recently become available in Australia, it is recommended for young children and adolescents but is not part of the National Immunisation Program.
Vaccines against other strains of the disease are recommended for persons travelling internationally to areas where epidemics of meningococcal A, C, W and Y occur such as the meningitis belt of sub-Saharan Africa. Vaccination is required for pilgrims to the Hajj. For up to date vaccination requirements talk to your travel doctor.
Vaccines against strains of meningococcal disease are also recommended for people at occupational risk of meningococcal disease such as laboratory workers, and people without a working spleen.
Because routine childhood vaccines do not protect against all serogroups of meningococcal disease, all people must still be alert for the symptoms and signs of meningococcal disease, even if they have been vaccinated.
How is it diagnosed?
Diagnosis is based on the patient's history and examination. This is sometimes difficult in the early stages of the disease. Confirmation of the diagnosis involves testing samples from the patient, including blood, cerebrospinal fluid or skin samples. The time taken to get a test result can vary depending on the tests performed.
How is it treated?
Patients with meningococcal disease need urgent treatment with antibiotics and treatment is usually started before the diagnosis is confirmed by tests.
What is the public health response?
Hospitals and laboratories notify cases of meningococcal disease to the local public health unit (PHU). PHU staff will work with the doctor, the patient or the patient's family to identify the people who have been close to the ill person (depending on the duration and the nature of their exposure). These people are called contacts.
Contacts are given information about meningococcal disease. A smaller group of close contacts are carefully identified and given clearance antibiotics because they are the people most likely to be carrying the bacteria.
These antibiotics eliminate the bacteria from the throat and help prevent it from being transmitted to others. Clearance antibiotics are different to the antibiotics used to treat the infection and people who receive clearance antibiotics are still at some risk of developing the disease. All contacts should therefore be aware of the symptoms of meningococcal disease and should see a doctor urgently if these occur.
For further information please call your local Public Health Unit on 1300 066 055