Populations of Bacteria on Petri Dishes (IMAGE) Institute of Science and Technology Austria Caption Populations of bacteria infected with viruses are sampled and analysed on Petri dishes to study infection dynamics. Credit IST Austria/Maroš Pleška 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.