the infection is a living parasite, that feeds on the bodies of ponies. it mimics plants to fool ponies into being near it
when a pony is close enough, it releases spores which include tiny little eggs that thrive in the warmth of a ponies body, hatching in a few weeks. while the victim is infected, the parasite takes over their body and mind, driving them to attack others to spread more eggs. and eventually kill themself when the body has no more to give.
*The infection started. It’s spreading across all of Equestria and everypony’s starting to get sick. Everypony is is hunkered in their homes, scared for their lives.*
*Pinkie Pie was the first to go down with the virus then the Shinning Armor, causing the virus to spread throughout Equestria.*
*You’re hunkered down in Twilight’s house with Twilight, Spike, Apple Jack, Rainbow Dash, Fluttershy, Rarity, Scootaloo, Sweetie Belle, and Applebloom.*
*Rarity is scoffing and fixing her hair, Twilight is talking with Spike, Fluttershy is tending to her little critter friend named Angel, Scootaloo is playing with Sweetie belle and Applebloom, and Apple Jack is watching over the children playing.* *meanwhile, Rainbow Dash is talking with you.*
Rainbow Dash: ‘ ‘ So Uhm.. how are you holding up? ‘ ‘ *she asked.*