This issue of the ECDC Communicable Disease Threats Report (CDTR) covers the period 31 December 2017-6 January 2018 and includes updates on hepatitis A, influenza, MERS, poliomyelitis and salomnellosis.

In the course of the 2016–17 influenza season, over 146 000 influenza detections across the WHO Europe Region have been reported.

In the course of the 2016–17 influenza season, nearly 146 000 influenza detections have been reported across the WHO European Region.

In the course of the 2016–2017 influenza season, nearly 146 000 influenza detections across the EU/EAA region have been reported.

This report which is part of the RAGIDA project (Risk Assessment Guidance for Infectious Diseases transmitted on Aircraft) provides viable options for decision-makers when faced with the choice of whether to contact trace air travellers and crew that were potentially exposed to infectious diseases during a flight.