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The symptoms of Legionnaires Disease begin by resembling a bout of flu where there is a headache and some muscle aching pain. This will last for 1 to 2 days and can be between 2 and 14 days after being infected with Legionnaires Disease.

After a couple of days the symptoms of the Legionnaires Disease worsen with a high fever (up to 40 degrees Celsius) and increased muscle pain. If the infection spreads to the lungs then the person can have difficulty breathing and develop a cough.

Up to a third of people with Legionnaires disease will develop symptoms including nausea and vomiting, and possibly diarrhoea.

If these symptoms persist then the patient should be tested for Legionnaires Disease. It is very difficult to identify Legionnaires Disease initially as the symptoms being exhibited are very similar to flu. The disease is highly dangerous and in 2009 led to 43 deaths in England and Wales, which is 12.5% of all reported cases that year. In reality, those suffering from Legionnaires Disease who have mistaken the symptoms for flu would make the number of cases much higher in the UK.