Showered (IMAGE) Northwestern University Caption In a new study, samples collected from showerheads and toothbrushed comprised more than 600 different viruses — and no two samples were alike. Credit Ivan Radic Usage Restrictions No restrictions. License Public Domain 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.