Heitman Spores (IMAGE) Duke University Caption A false color scanning electron micrograph shows infectious spores of Cryptococcus fungi (purple) decorating the surface of the specialized structure where they are produced. These spores are readily dislodged by air currents, aerosolized, and then inhaled. They are small enough to penetrate deeply into the airways to lodge in the alveoli to cause an initial pulmonary infection that then spreads via the bloodstream to infect the brain. These infectious spores are produced by sexual reproduction, including the process of unisexual reproduction. Credit Edmond Byrnes and Joseph Heitman, Duke University 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.