Air Travel (IMAGE) Barcelona Institute for Global Health (ISGlobal) Caption Returning travellers may introduce infectious diseases such as Zika into non-endemic regions. Credit Ross Parmly / Unsplash Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.