Legionella was discovered after an outbreak in 1976 among people who went to a Philadelphia convention of the American Legion. Those who were affected suffered from a type of pneumonia that eventually became known as Legionnaires' disease.

Where was the first outbreak of Legionnaires disease?

The 1976 Legionnaires disease outbreak, occurring in the late summer in Philadelphia, Pennsylvania, United States was the first occasion in which a cluster of a particular type of pneumonia cases were determined to be caused by the Legionella pneumophila bacteria.

Where does Legionella come from?

The bacterium Legionella pneumophila and related bacteria are common in natural water sources such as rivers, lakes and reservoirs, but usually in low numbers. They may also be found in purpose-built water systems such as cooling towers, evaporative condensers, hot and cold water systems and spa pools.

Do people still get Legionnaires disease?

Most people catch Legionnaires' disease by inhaling the bacteria from water or soil. Older adults, smokers and people with weakened immune systems are particularly susceptible to Legionnaires' disease.

How was the Legionella in Philadelphia in 1976 first detected?

In wasn't until December 1976 that Dr. Joseph McDade, a CDC laboratory scientist, using the technique of guinea pig inoculation, was able to isolate the bacterium that caused the disease and identify it as Legionella pneumophila.

Legionnaires’ disease explained

21 related questions found

What hotel was the Legionnaires disease?

Cases of Legionnaires' disease associated with an Albert Lea hotel are prompting state health officials to warn anyone who stayed at the hotel in late June to seek medical care promptly if they are ill.

What is the average death rate for community acquired Legionnaires disease?

In community-acquired cases, Legionnaires' disease frequently leads to hospitalisation and has been associated with a case fatality of 9–13% in Catalonian [4] and French [5] surveillance data spanning at least a decade.

Does Legionnaires disease go away by itself?

The condition may cause fever, headaches, and muscle aches, but the symptoms usually go away on their own. Typically, less than 5 percent of people exposed to the bacteria develop Legionnaires' disease. Of every 20 people who become ill from the condition, one to six will die of it, based on CDC statistics. 4.

Can I get Legionnaires from my shower?

Legionella bacteria is dispersed in airborne water droplets, so the spray created by a shower is the perfect delivery mechanism. Anyone using a contaminated shower risks breathing in the bacteria and developing Legionnaires' disease as the bug takes hold in the lungs.

Does Legionnaires affect the brain?

Cerebral and cerebellar symptoms are frequently associated with Legionnaires' disease. However, corresponding brain lesions are difficult to demonstrate using either computed tomography (CT) or magnetic resonance imaging (MRI).

Can you get Legionnaires disease from tap water?

You can get Legionnaires' disease from things like:

taps and showers that are not used often.

Who named Legionnaires disease?

Five months later, after much speculation and failed tests, CDC microbiologist Joseph McDade finally identified a red, rod-shaped organism as the cause of the illness. It was a bacteria unlike anything scientists had seen before. They called it Legionella.

Is there a vaccine for Legionnaires disease?

There are no vaccines that can prevent Legionnaires' disease. Instead, the key to preventing Legionnaires' disease is to reduce the risk of Legionella growth and spread. Building owners and managers can do this by maintaining building water systems and implementing controls for Legionella.

How many died from Legionnaires disease?

318 people became ill and at least 32 people died. There is a possibility that more people died from it (which might make it the deadliest recorded outbreak), but these people were interred before the Legionella infection was recognized. The source of the bacteria was a hot tub in the exhibition area.

How did Pontiac fever get its name?

Just as Legionnaires' disease got its name from the outbreak that originally brought the disease to worldwide attention, Pontiac fever was named after an outbreak that occurred in Pontiac, Michigan in 1968.

Where is Legionnaires disease most common?

Worldwide, waterborne Legionella pneumophila is the most common cause of cases including outbreaks. Legionella pneumophila and related species are commonly found in lakes, rivers, creeks, hot springs and other bodies of water.

What is the pink stuff on my shower floor?

The “pink mold” you may find in your shower actually isn't mold, but a very common strain of airborne bacteria that's found throughout the world. The bacteria, Serratia marcescens, cause that pink or even red slime you might find in your shower, toilet bowl, or around other water fixtures.

How often should shower heads be disinfected?

All shower heads should be removed, cleaned, descaled (if necessary) and disinfected every three months. Keep a record of the dates when the shower heads were cleaned in your diary. Shower heads produce a fine spray and aerosol and are an ideal source for legionella bacteria.

How often should a shower not in regular use be run?

If you have taps or showers you don't use regularly, run them for 5-10 minutes at least once a month to clear the pipes. Try to clean the outside of taps and shower heads at least once every three months. Ensure there aren't any places where water can stay still and build up bacteria.

Can you smell legionella?

Yes, it's possible to Smell legionella. Your water may have a distinct "rotten egg" or sulfur smell when it's contaminated.

Can you get Legionnaires disease from a humidifier?

Legionella is transmitted in aerosols which have to be drawn deep into a person's respiratory system. Any humidifier that produces an aerosol such as an atomising humidifier or ultrasonic mister, particularly if they spray directly in the air where people are present, is therefore a potential source of concern.

What are the first signs of Legionnaires disease?

Legionnaires' disease symptoms are similar to other types of pneumonia and it often looks the same on a chest x-ray.

• Cough.
• Shortness of breath.
• Fever.
• Muscle aches.
• Headaches.

How do you prevent Legionnaires disease at home?

Minimising the risk of a Legionella infection at home

1. Always wear gloves.
2. Wear a face mask to help avoid inhaling aerosols.
3. Open bagged material with care to avoid inhaling airborne particles in the mix.
4. Keep the mix damp while in use.
5. Wash your hands thoroughly after use.

What antibiotics treat Legionella?

Mild Legionnaires disease can be treated with a single oral antibiotic regimen that have activity against legionella pneumophila including fluroquinolones such as levofloxacin, and moxifloxacin, macrolides like azithromycin, clarithromycin.

Is Legionella disease fatal?

About 1 out of every 10 people who gets sick with Legionnaires' disease will die due to complications from their illness. For those who get Legionnaires' disease during a stay in a healthcare facility, about 1 out of every 4 will die.