The Metamorphosis Plague for example, is it spawned by admins or is it really a result of events that happened in game? Does it exist and does it alter species or do the admins pick people and alter their species?
The 'Derra Virus' is a means whereby a player can choose to become a species which has just been discovered and is intended as a tool to be able to populate a new species. It is a game mechanic chosen by players so you cannot 'catch' it unless you choose to do so.
It works by allowing a change species option for up to 2 weeks after a new species is discovered in game.
Ka`rla, technically the Derra Virus and Metamorphosis plague are 2 different things. The Derra Virus was used to explain hostilities in the Dera System for combat beta while, if I recall correctly, the Metamorphosis plague is RP'd as being caused by the attempt of creating a cure for the Derra Virus.
But no. Like others have said, the Metamorphosis plague is just an IC way of explaining the race changing feature.