On planet Earth, the capital of the Earth Sphere in my universe, in the year 2127, the population has increased(in density per area) by about 410%, due to the discovery of "key" bridges- traversable tears in space-time. As a result, Humanity spread across dozens of planets.
Therein lies the problem.
There is a spore-based virus, that had lied dormant for billions of years, that was released when the humans landed on that planet. It got taken back to Earth when the colony ship returned.
Now it's on Earth, an ecumanopolis with a population of 31 billion people.
The virus has the following symptoms:
- Deep purple rashes
- Coughing up purple, blobby blood
- Rapid decomposition of limbs
- Bone and muscle growths(external)
- Sporous growths on the body
- Brain failure
It also has an incubation time of 3 weeks, the time until death 5 weeks. The equivalent of CDC is about the same efficiency as modern time, with maybe about a 150% increase in effectiveness.
How fast would it be before the entire planet was infected?