<I>Candida tropicalis</I> (IMAGE) Center for Genomic Regulation Caption If the human immune system is weakened, harmless yeasts can have lethal effects. Candida tropicalis infects human tissue (Scanning electron micrographs). Credit Hans Knöll Institue Jena, Germany. Usage Restrictions Creative Commons 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.