How do I simulate an infection with identical sprites?

I'd like to simulate an infection. I have 100 sprites, and I'd like to put one sprite with a variable "virus" = 1 that when collide with other sprite pass this variable, set frame to 1 (red color) and so on.

I study the tutorial "HOW TO HANDLE INSTANCES OF SAME SPRITE COLLISION / COLLIDING." but it works for me I don't know how.

Anyone can help me, maybe with a capx to study?

Thanks

Great! Thanks!