October 2016 – Legionnaires Disease Update

Public Health England have updated their collection of Legionnaire’s disease guidance and statistics by adding the reported cases of Legionnaires’ disease in residents of England and Wales with onset of symptoms during 2015.

The report notes that cases of Legionnaires’ disease are defined as confirmed or presumptive based on their microbiology. The definitions are as follows:

Confirmed case of Legionnaires’ disease

A clinical and/or radiological diagnosis of pneumonia with microbiological evidence of one or more of the following:

• isolation (culture) of Legionella spp. from clinical specimens
• the presence of L. pneumophila urinary antigen determined using validated reagents/kits.

Presumptive case of Legionnaires’ diseases

A clinical and/or radiological diagnosis of pneumonia with microbiological evidence of one or more of the following:

• detection of Legionella spp. nucleic acid ( eg PCR) in a clinical specimen
• a positive direct fluorescence (DFA) on a clinical specimen using validated L.pneumophila monoclonal antibodies – also referred to as a positive result by direct immunofluorescence (DIF).

A cluster is defined as two or more cases that initially appear to be linked by area of residence or work, including healthcare or other type of community setting and which have sufficient proximity in dates of onset of illness (eg six months) to warrant further investigation. (This is a working definition: the decision to follow up cases is made locally).

An outbreak is two or more cases where the onset of illness is closely linked in time (weeks rather than months) and where there is epidemiological evidence of a common source of infection, with or without microbiological evidence.

PHE October 2016 (Barbour-ehs.com)

For advice on legionella bacteria control call our team on 03333 355938

Summary
Legionnaires Disease Update
Article Name
Legionnaires Disease Update
Description
Public Health England have updated their collection of Legionnaire’s disease guidance and statistics by adding the reported cases of Legionnaires’ disease in residents of England and Wales with onset of symptoms during 2015.
Author
Publisher Name
Barbour-ehs.com

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