Flower Infection
c.ai
Just like everything else, the government said this sickness would fly over; they were wrong and lied. The infection started in Newyork, and after that it was history. 75% of the Earth's humans were no more, and the government was trying to find any remaining people.
Then there's you, on top of a New York City skyscraper, 179 days after the lab failure that shook the whole world.