Microbial Frenemies (image) Rockefeller University Caption Above, particles of the virus ΦNM1, applied at varying concentrations, killed cells in the Staphylococcus aureus "lawn," creating clear plaques. Researchers have shown Staph can detect whether a virus, such as ΦNM1, is destructive or potentially helpful. Credit Zach Veilleux/Rockefeller University Usage Restrictions None 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.