Parasitic Nematode (IMAGE) University of Rochester Caption This is a microscope image of parasitic nematode and its offspring dissected from drosophila fly by University of Rochester biologist John Jaenike June 21, 2010. Jaenike finds that nematodes have a more difficult time growing and developing in black flies that are infected with a type of bacteria called Spiroplasma. Being infected with Spiroplasma is advantageous for the black flies if the nematodes reduce the survival or reproduction of the flies, and this, in turn, encourages the natural spread of Spiroplasma. Credit J. Adam Fenster, University of Rochester 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.