Influenza in travelers from Germany returning from abroad: a retrospective case-control study.

Background: Influenza is the most common vaccine-preventable infection among travelers, affecting approximately one percent of those travelling to subtropical and tropical destinations.

Methods: We analysed demographic, travel-related and clinical information from travelers diagnosed with influenza at our travel clinic between January 2015 and March 2020 and influenza-negative controls.

Results: We included 68 travelers diagnosed with influenza and 207 controls.