Rosebud

The time is 2043. World War Three broke out two months ago, on May 1st, and along with the War came bombings and then disease. One particular disease, however, can do more than the others... an airborn virus called "Rosebud" was spawned in this chaos, a pestilence that spreads like wild fire, attacking and disintegrating the nervous system until any and all functions are rendered impossible as the virus makes its way up the spinal column, eating away. Almost everyone who contracts the disease dies in a five-day period.
"Almost" is the key word.
Because .4% of the population is about to experience some very adverse effects.