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Legionnaires’ disease remains an uncommon and mainly sporadic respiratory infection with an overall notification rate of 1.9 cases per 100 000 population for the EU/EEA in 2020.

This report presents an analysis of participants' results for the 2020-2021 External Quality Assessment (EQA) exercises in the EU/EEA countries.

This is the first EQA exercise for laboratories participating in surveillance from the ELDSNet network that has been
organised by ECDC since 2015 and the EQA format and arrangements have changed. The current EQA scheme
uses an outbreak scenario with a package of clinical and environmental samples for the participating laboratories to process, depending on their technical capacity and protocols.

Legionnaires’ disease remains an uncommon and mainly sporadic respiratory infection with an overall notification rate in 2019 for the EU/EEA of 2.2 cases per 100 000 population.

This issue of the ECDC Communicable Disease Threats Report (CDTR) covers the period 17-23 January 2021 and includes updates on Legionnaires' disease, COVID-19, dengue, influenza, avian influenza A(H5N6), avian influenza A(H9N2), poliomyelitis and chikungunya.

This issue of the ECDC Communicable Disease Threats Report (CDTR) covers the period 13-19 December 2020 and includes updates on COVID-19, dengue, chikungunya, Legionnaires' disease, seasonal influenza and avian influenza.

This report provides an analysis of the EQA performance of laboratories in the 28 EU/EEA countries in relation to the detection/isolation, identification, enumeration and quantification of Legionella spp. and the further characterisation of L. pneumophila, by serogrouping and sequence-based typing, from both clinical and environmental samples, where applicable.

The ECDC Communicable Disease Threats Report (CDTR) is a weekly bulletin for epidemiologists and health professionals on active public health threats. This issue covers the period 29 November-5 December 2020 and includes updates on COVID-19, Legionnaires' disease, polio, seasonal influenza and Middle East respiratory syndrome coronavirus (MERS-CoV).

The ECDC Communicable Disease Threats Report (CDTR) is a weekly bulletin for epidemiologists and health professionals on active public health threats. This issue covers the period 15-21 November 2020 and includes updates on COVID-19, Ebola virus disease, dengue, influenza A(H1N2), Legionnaires' disease, seasonal influenza, West Nile fever and TBE.