map (IMAGE) Washington University in St. Louis Caption This map of the eastern United States illustrates the location for each mosquito population used in the study. Each color indicates the range of a numbered climate zone. Credit Katie Westby / Washington University in St. Louis Usage Restrictions For editorial purposes License Original 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.