The Legionella bacterium is a small, aerobic, waterborne, gram-negative, unencapsulated bacillus that is nonmotile and oxidase and catalase positive. Legionella bacterium is a fastidious organism and will not grow anaerobically on a standard media.


Is Legionella a communicable disease?

Legionnaires’ disease is a type of pneumonia caused by bacteria. You usually get it by breathing in mist from water that contains the bacteria. The mist may come from hot tubs, showers, or air-conditioning units for large buildings. The bacteria don’t spread from person to person.

What is the most distinguishable feature of Legionella pneumophila infection?

The primary feature of the pathogenesis of Legionella is their ability to multiply intracellularly. But the whole infection process in both protozoa and mammalian cells including bacterial cell attachment to host cells, survival, intracellular replication, and cell-to-cell spread all indicate its pathogenesis [18].

Is Legionnaires disease acute or chronic?

Legionellosis is a generic term describing the pneumonic and non-pneumonic forms of infection with Legionella. The non-pneumonic form (Pontiac disease) is an acute, self-limiting influenza-like illness usually lasting 2–5 days. The incubation period is from a few and up to 48 hours.

Is Legionella a protozoa?

Bacteria from the genus Legionella belong to this group of pathogens. They are environmental bacteria and ubiquitous in nature, where they parasitize protozoa.

What kind of pneumonia is either chemical or bacterial in origin?

Community-acquired pneumonia. Community-acquired pneumonia can be caused by bacteria, viruses, and fungi.

What causes Legionella in water?

Most people become infected when they inhale microscopic water droplets containing legionella bacteria. This might be from the spray from a shower, faucet or whirlpool, or water from the ventilation system in a large building. Outbreaks have been linked to: Hot tubs and whirlpools.

How do you contract Legionella?

People contract Legionnaires’ disease by inhaling small droplets of water (aerosols), suspended in the air, containing the bacteria. Certain conditions increase the risk from legionella if: the water temperature in all or some parts of the system may be between 20-45 °C, which is suitable for growth.

Can you drink water with Legionella?

People can get Legionnaires’ disease or Pontiac fever when they breathe in small droplets of water in the air that contain the bacteria. Less commonly, people can get sick by aspiration of drinking water containing Legionella.

What antibiotics treat Legionella?

Macrolides and fluoroquinolones should be the drugs of choice for the treatment of established Legionellosis. Oral macrolides should be prefered in patients with mild to moderate pneumonia; within the macrolides, azithromycin has the most favourable profile of activity.

Is Legionella pneumophila aerobic or anaerobic?

Species of the genus Legionella are Gram-negative, non-spore-forming, rod-shaped, aerobic bacteria.

Where does Legionella grow best?

The Legionella bacteria are found naturally in the environment, usually in water. The bacteria grow best in warm water, like the kind found in hot tubs, cooling towers, hot water tanks, large plumbing systems, and decorative fountains that are not properly maintained.

How long does it take to recover from Legionnaires?

Antibiotic treatment usually lasts 1 to 3 weeks. Most people make a full recovery, but it might take a few weeks to feel back to normal.

What is the incubation period for Legionnaires disease?

The incubation period for Legionnaires’ disease ranges from two to 10 days, but is usually five to six days.

How serious is Legionella?

Legionnaires’ disease is a serious, life-threatening illness that requires prompt treatment. Legionella may also cause a milder condition referred to as Pontiac fever. Pontiac fever doesn’t cause pneumonia and isn’t life-threatening. It has symptoms similar to those of a mild flu, and it usually goes away on its own.

What temp kills Legionella?

Legionella needs a certain set of conditions to be able to survive. It needs to live in a temperature range of between 20 and 50˚C, above 50˚C it will start to die off. Heat will kill legionella bacteria, cold will not. If you have water below 20˚C it will go into hibernation, it will not die.

What are legionella bacteria?

Legionella is a genus of pathogenic Gram-negative bacteria that includes the species L. pneumophila, causing legionellosis (all illnesses caused by Legionella) including a pneumonia-type illness called Legionnaires’ disease and a mild flu-like illness called Pontiac fever.

What bacteria causes Pontiac fever?

Pontiac fever is a mild flu-like illness caused by exposure to Legionella bacteria, which is found in water.

What are the 3 types of pneumonia?

There are more than 30 different causes of pneumonia, and they’re grouped by the cause. The main types of pneumonia are bacterial, viral, and mycoplasma pneumonia.

How do you categorize pneumonia?

A pneumonia infection is classified based on how it is acquired and can be categorized into community-acquired, hospital-acquired, healthcare-acquired, or aspiration pneumonia.

What type of pneumonia does COVID-19 cause?

A severe complication of COVID-19 is viral pneumonia. Distinguishing viral pneumonia from bacterial pneumonia is difficult in the community.

What are the symptoms of Legionella?

  • high temperature, feverishness and chills;
  • cough;
  • muscle pains;
  • headache; and leading on to.
  • pneumonia, very occasionally.
  • diarrhoea and signs of mental confusion.
How do you get rid of Legionella in water?

Chemical shock using an elevated level of a disinfectant, such as chlorine, for a limited duration can control Legionella in a potable water system.

Does Legionella have a capsule?

L. pneumophila is a Gram-negative, non-encapsulated, aerobic bacillus with a single, polar flagellum often characterized as being a coccobacillus. It is aerobic and unable to hydrolyse gelatin or produce urease.

Can you get legionella from a tap?

Harmful bacteria can build up in your taps or on your shower head for instance. This is known as Legionella bacteria. If you breathe in this bacteria it can make you ill and you may be diagnosed with something called Legionnaires’ disease.

Can I get Legionnaires from my shower?

Legionella is transmitted by breathing it in the form of vapour. That is why showers are especially high risk.

What disinfectant kills legionella?

Chlorine dioxide (ClO2) is another popular choice for disinfecting water sources to control legionella, other bacteria and importantly biofilm.

Does Legionella have a smell?

Considering this, it’s important to make sure legionella bacteria can’t grow in your water heater. Beyond legionella, your water heater can become infested with sulfate-reducing bacterium. When this happens, your water may have a distinct “rotten egg” or sulfur smell to it.

How long should you flush taps for Legionella?

The five-minute flush Each tap and water outlet (including showers) should be opened and left to run through for at least five minutes. The shower should be turned up so it’s as hot as possible.

How common is Legionella UK?

Just over 60% of the 355 confirmed cases of Legionnaires’ disease, (216 cases), were reported in individuals aged 60 years and over. Over the three-year period 2014 to 2016, the incidence rate in England and Wales reached a mean of 6.1 cases per million population (pmp).

What is the best antibiotic for Legionella pneumonia?

The available evidence suggests that quinolones (the most researched are ciprofloxacin and levofloxacin) are the treatment of choice in the case of severe Legionella pneumonia. Newer macrolides (especially azithromycin) have been shown to have some additional beneficial effect.

Does amoxicillin cover Legionella?

However, amoxicillin/clavulanic acid, and amoxicillin (132) were less active than the macrolides against the non-pneumophila Legionella species (Tables 1, 2).

Does Augmentin treat Legionella?

Neither amoxicillin nor amoxicillin clavulanate cover the atypical organisms, Mycoplasma pneumoniae, Chlamydia pneumoniae or Legionella sp.

Is Legionella pneumophila motile?

Legionella pneumophila is a ubiquitous gram-negative motile bacterium that replicates inside protozoa in aquatic environments (27, 77, 86).

Is Legionella pneumophila airborne?

In order for Legionella to be inhaled and cause disease once aerosolized, it must remain airborne.

What is the morphology of Legionella?

Legionella cells are thin, somewhat pleomorphic Gram-negative bacilli that measure 2 to 20 μm (Fig. 40-2). Long, filamentous forms may develop, particularly after growth on the surface of agar. Ultrastructurally, Legionella has the inner and outer membranes typical of Gram-negative bacteria.

Can you get Legionella twice?

Yes, it’s possible to get it more than once because there are many different strains of Legionella bacteria. People who are at risk – the elderly, smokers, people with low immunity and those with other illness – should be aware of the disease and of the precautions they should take to protect themselves.

Can Legionella grow in cold water?

Legionella grows best within a certain temperature range (77°F-113°F). … A note about cold water: In warm climates, water in pipes that carry cold water may reach a temperature that allows Legionella to grow.

Is Legionella a pathogen?

The bacterial pathogen Legionella pneumophila is found ubiquitously in fresh water environments where it replicates within protozoan hosts. When inhaled by humans it can replicate within alveolar macrophages and cause a severe pneumonia, Legionnaires disease.

Can Legionnaires cause brain damage?

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 Legionella cause brain damage?

However, several recent reports describe abnormalities on cerebral MRI from patients with neurological symptoms and Legionella infection,10,15 suggesting that brain lesions in legionnaires disease are more common than previously thought.