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Aspergillus Unit

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Topics

Aspergillus and common diseases

 

 

Aspergillus

 

Aspergillus is a group of saprophytic moulds world-wide. Only a few of them can cause illness in humans and animals : Aspergillus fumigatus (the most frequent), A. flavus, A. niger, A.nidulans, A terreus.
Most people are naturally immune to Aspergillus. However, when disease does occur (apergillosis), it takes several forms.
The type of diseases caused by
Aspergillus, ranged from an "allergy"-type illness to life-threatening generalised infections. The severity of aspergillosis is determined by various factors but one of the most important is the status of the immune system of the person.

Aspergillus fumigatus

 

 

Allergic bronchopulmonary aspergillosis (ABPA)

 

This is a condition which produces an allergy to the spores of the Aspergillus moulds. It is quite common in asthmatics; up to 20% of asthmatics might get this at some time during their lives. ABPA is also common in cystic fibrosis patients, as they reach adolescence and adulthood. The symptoms are similar to those of asthma: intermittent episodes of feeling unwell, coughing and wheezing. Some patients cough up brown-coloured plugs of mucus. The diagnosis can be made by X-ray or by sputum, skin and blood tests. In the long term ABPA can lead to permanent lung damage (fibrosis) if untreated.
The treatment is with steroids and Itraconazole.

 

 

Aspergilloma

 

Aspergillus grows within a cavity of the lung, which was previously damaged during an illness such as tuberculosis or sarcoidosis. The spores penetrate the cavity and germinate, forming a fungal ball within the cavity. Any lung disease which causes cavities can leave a person open to developing an aspergilloma.
The person affected may have no symptoms (especially early on). Weight loss, chronic cough and feeling rundown are common symptoms later. Coughing of blood (haemoptysis) can occur in up to 50-80% of affected people.
The diagnosis is made by X-rays, scans of lungs and blood tests.
Treatment depends on many factors and includes antifungal therapy or surgical removal.

 

Aspergillus sinusitis

 

Aspergillus sinusitis happens in a similar way to aspergilloma. In those with normal immune systems, stuffiness of the nose, chronic headache or discomfort in the face is common. Drainage of the sinus, by surgery, usually cures the problem.
When patients have damaged immune systems - if, for example they have had leukaemia or have had a bone marrow transplant- Aspergillus sinusitis is more serious. Since sinusitis results from invasive aspergillosis (see below). The symptoms include fever, facial pain, nasal discharge and headaches. The diagnosis is made by finding the fungus in fluid or tissue from the sinuses and with CT scans. Treatment with powerful antifungals (e.g. amphotericin) or surgery is essential.

 

 

Invasive aspergillosis 

 

Many people with damaged or impaired immune system die from invasive aspergillosis. Their chances of living are improved the earlier the diagnosis is made but unfortunately there is no good diagnostic test. Often treatment has to be started when the condition is only suspected.
Invasive aspergillosis is usually clinically diagnosed in a person with low defences such as bone marrow transplant, low white cells after cancer treatment, AIDS or major burns. There is also a rare inherited condition that gives people low immunity (chronic granulomatous disease) which puts affected people at risk. People with invasive aspergillosis usually have a fever and symptoms from the lungs (cough, chest pain or discomfort or breathlessness) which do not respond to standard antibiotics. X-rays and scans are usually abnormal and help to localise the disease. Bronchoscopy (inspection of the inside of the lung with a small tube inserted via the nose) is often used to help to confirm the diagnosis.
Sometimes the fungus can transfer from the lung through the blood stream to the brain and to other organs, including the eye, the heart, the kidneys and the skin. Usually this is a bad sign as the condition is more severe and the person sicker with higher risk of death.
Treatment is with antifungal drugs such as amphotericin-B and/or itraconazole and is difficult. Amphotericin-B has to be given by vein in large doses. In some patients the treatment can damage kidney and other organs. Newer forms of amphotericin-B (Amphotec or Amphocil, Abelcet or AmBisome) are useful, especially when the patient experiences side-effects, as there are less toxic. Itraconazole is generally given orally (also in large doses, e.g. at least 400 mg daily). New antifungal drugs (azoles and echinocandins) are presently launched. The earlier treatment is started the better the chances of survival. In patients with low numbers of white cells (infection fighters), recovery of these cells can be important in stopping the growth of the fungus. Sometimes surgery is also required. Overall, about a third of patients survive invasive aspergillosis if treated and none survive if they are not treated.

For more information see Aspergillus for Patients