Legionnaires Disease: Things You Need To Know

Things You Need To Know About Legionnaires Disease

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A form of atypical pneumonia, Legionnaires’ disease can develop due to any type of Legionella bacteria. This article shares a detailed insight on things you need to know about Legionnaires’ disease.

Legionellosis is a lung disease that differs in severity caused by the bacterium Legionella pneummophilia. Individuals are affected by legionellosis due to fine particles of aerosol that are inhaled through contaminated water sources. These tiny aerosols are invisible to the eye and can be inhaled straight to the lungs causing different forms of Legionnaires’ disease. It occurs in two distinctive forms.

The mild form of respiratory infection is known as Pontiac fever whereas the potentially threatening form of the disease is called Legionnaires’ fever, also known as ‘Legion fever’. Although a person affected with Pontiac fever can recover without treatment being administered it is important to diagnose and detect legion fever at an early stage. Antibiotics need to be administered immediately if an individual is suspected with Legionnaires’ fever.

How the name Legionnaires’ came into Existence

The name Legionnaires’ disease came into being after an outbreak of pneumonia that affected people attending a convention in Philadelphia called the ‘American Legion’ on July 1976.

Although outbreaks of Legionnaires’ disease have garnered significant attention from media circles, this disease is also associated as an occurrence with singular and isolated cases not relating to an outbreak.

Although this disease does occur throughout the year in different countries, it is usually at its peak during autumn and summer. If related to an outbreak the death rate due to this disease stands between 5 and 30 percent. Infected water through sources such as spraying fountains, large air conditioners, room humidifiers, showers, and hot water systems can cause outbreaks of legionellosis. 

Symptoms Associated with Legionnaires disease

Individuals develop legionellosis when minute aerosol particles inhaled by them contain legionella bacteria. Contaminated water sources through mist producing devices such as heaters and large air conditioners at a hospital, workplace, or public places can affect individual with low immunity. The symptoms of Legionnaires’ disease may differ among individuals, however, symptoms that occur commonly are tiredness, loss of appetite, headache, muscle ache, joint pain, cough, fever and diarrhea and vomiting in some cases.

In most cases individuals with Pontiac fever recover without treatment, they do experience mild fever and joint pains but do not develop pneumonia. Individuals with Legionnaires’ disease need to be administered with antibiotics immediately and are prone to pneumonia. Chest X-rays of individuals of individuals suffering from Legionnaires disease often reveal the presence of pneumonia.

Who can develop Legionnaires’ disease?

Although this disease is not restricted to a particular age group, the number of cases is high among older people. Individuals with lung diseases and cigarette smokers are at a high risk of acquiring this disease. Individuals with HIV, cancer, and diabetes are also at a high risk of acquiring this disease because of their weakened immune system. The chances of complications arising are significantly high among individuals who are suffering from another disease before the onset of legionellosis.

Treatment for Legionnaires’ disease

Diagnosis of this disease is determined by sputum culture and urinary antigen test. Individuals with Legionnaires’ disease are administered antibiotics such as erythromycin, doxycycline and/or Tetracyclines and other similar drugs which have proven effective in treatment. Mortality rates are relatively low when individuals are given antibiotics at an early stage. A series of tests are required in order to diagnose the disease properly.                 


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  • anusha  24-10-2017
    Reading about such diseases and susceptibility of common people to these is indeed scary. But I think it's better to be scared but aware instead of sorry. Great that you are creating health awareness. An article like this also reminds us to be thankful for our good health, and be compassionate towards the less fortunate.
    reply 1
    • realityspeaks  24-10-2017
      Absolutely. We need to be thankful for our good health. It's our overall health that determines how we cope up with our lives.
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  • goldstay  21-10-2017
    I am a nurse and in my experience working in the communicable disease ward, I have seen my patients with HIV developing the symptoms of legionnaire's disease. Thank you for sharing and keep on posting. :)
    reply 1
    • realityspeaks  23-10-2017
      Indeed, Legionnaires 'Disease can be lethal for individuals with lowered immunity.
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  • abhi_bangal  20-10-2017
    Well, honestly speaking, I didn't read the entire article. As your screen name suggests, it's reality speaks and when reality speaks, it speaks very harshly. I have always had a fear of reading such articles with the thing at the back of the mind that, I'd be the first person to have something like this illness. So, I better choose not to read it in the first place. Medical articles and journals are really very scary to read. But I am sure you have written the unread stuff great too, because I have read your other articles.
    reply 1
    • realityspeaks  23-10-2017
      Yeah, that's alright. We do feel we have symptoms similar to the ones mentioned in a medical article that relates to a condition or illness.
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