Expanding Habitats (IMAGE) La Jolla Institute for Immunology Caption Zika, JEV, dengue, West Nile virus and yellow fever have spread in recent years as more people around the world have moved to cities and climate change has allowed the mosquitoes that carry these diseases to expand their habitat. People in many countries now live at risk of encountering multiple harmful flaviviruses in their lives. Credit Madeline McCurry-Schmidt, La Jolla Institute for Immunology 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.