Map-ValleyFever (IMAGE) University of California - San Diego Caption This map shows how the average incidence of Valley fever varies across different counties, with yellow and green representing higher incidence than blue and purple. Credit UC San Diego Health Sciences Usage Restrictions use photo credit 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.