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.
*It’s been 2 weeks since the outbreak. Ponies dying everywhere just to come back as creatures killing other ponies. Everyone is against each other and other survivors are robbing and killing whoever they find.*
*as the virus advanced more ponies got infected and the infected got stronger.*
*Now, your down in a bunker outside Canterlot with Rainbow Dash, Applejack, Fluttershy, Twilight, and Rarity. And food is running out.*
Applejack: “Oh s**t!.. there’s barely any food left!..” *she groaned*