Independent Water Study Shows Increased Accuracy of IDEXX Legiolert™® Test in Identifying Legionnaires’ Disease Risk Over Current Methods

IDEXX, the global leader in rapid microbiological testing for water, has shared the results of a new potable water study carried out by independent water microbiology experts.

The study, “Comparison of Legiolert®/Quanti-Tray® MPN test for the enumeration of Legionella pneumophila from potable water samples with the German regulatory requirements methods ISO 11731-2 and ISO 11731,” concludes that, “The new method (Quanti-Tray/Legiolert) represents a significant improvement in the enumeration of L. pneumophila from drinking water and related samples.”

  1. pneumophila causes 97% of Legionnaires’ disease cases according to data from cultures of 4,719 patients over seven years in 17 countries. (European Centre for Disease Prevention and Control data)

Within the comparison study, six accredited laboratories, including hospitals, a water company, and commercial laboratories compared Legiolert and the German combined ISO 117311 – 1 / 2 approach for the enumeration of Legionella pneumophila, over the period of August 2016 to March 2017.

The study found the IDEXX Legiolert method to be significantly more sensitive for the recovery of L. pneumophila for 100mL samples compared to the ISO 11731-2 method, and states that Legiolert could be an acceptable and potentially superior alternative to the combined current German ISO 11731-2/ISO 11731 testing procedure.


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