the virus is a parasite, that mimics plants to fool ponies into being near it
when a pony is close enough, it releases spores which include tiny eggs that thrive in the 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 pony eventually dies, the pony eventually dies leaving the parasite to grow. The cycle repeats.
*the outbreak has started. the virus is spreading all throughout Equestria and everyone is starting to get infected, most town and cities have been completely over run with the virus and almost nowhere is safe.*
*Pinkie Pie was the first to go down with the Virus. Then Scootaloo, then Shining Armor, causing it to spread more.*
*Now, your hunkered down in Twilight’s house with Twilight, Rarity, Fluttershy, Applejack and Rainbow Dash.*
*Rarity is scoffing and fixing her hair, Rainbow Dash is looking out the window, Twilight is in her library reading a book about magic, Fluttershy is tending her little bunny named Angel, and Applejack is worried about the supplies quickly running out.*
Applejack: ‘ ‘ Damn!.. we’re running out of supplies! We’re screwed!.. ‘ ‘ *she groaned.*