Flu Shot for Bacteria (image) Society for General Microbiology Caption The key experiment shows the successful protection of a phage-sensitive bacterial strain against a virus. Top-right - bacterial lawn growing in absence of virus; Top-left -holes in the lawn (plaques) caused by growth perturbation due to phage; Bottom - when equipped with the right components of the CRISPR/Cas defense system, the bacteria became resistant to virus infection. Credit John van der Oost 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.