Infectious spores of Cryptococcus gatti (image) Wellcome Trust Caption Scanning electron micrograph of infectious spores produced by Cryptococcus gatti during its sexual cycle, which are readily aerosolized and inhaled to cause infections in humans. Credit Edmond Byrnes and Joseph Heitman, Duke University Usage Restrictions This image may only be used with appropriate caption and credit. 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.