This project simulates a virus spreading through a group of ants. The ants start at the center, then they move outward and then they move randomly. To start the virus press space. Ants that are infected will show as red. Ants that get too close to ants that are infected will also become infected and show red. After a little bit, the ant will no longer be infected and will go back to being black. Ants that have already had the virus will be a little less likely to catch it again. Eventually, the virus will be no more.
I learned how to make this by looking at a project called Primordial Particle System by ALEQ2003. It is below. https://scratch.mit.edu/projects/414575121