A civilian passenger ship arrives on Arcadia. One civilian, a male in his early 40's walked through security and passed without a hitch. He was a recent kidnapping victim who had no recollection of what happened to him during his time away. He, Harvey Cooper, would get on the bus, coughing a bit. Once he sat himself down, he fell into a larger coughing fit, and waved off any help other passengers tried to give him. They would probably scoot a bit away, a little worried about their health. Harvey's coughs subsided, and he looked out the window, smiling as the Bus began to move. Around thirty minutes into his trip, Harvey began to cough once again, only, this was more violent than the previous fits he had gone through. He spat out blood, falling to the ground as he began to asphyxiate on his own blood. A rotten smell arose from his body, as he writhed around, choking on his own blood while he tried to ask for help. He soon fell limp, dead. The Bus was probably in an uproar, and maybe stopped. If so, this would raise the risk of becoming infected. If not, the bus would have to hurry to its destination, otherwise the passengers would have an even higher chance of becoming infected.
(I'm tempted to make these zombie-like creatures, just to add damage, however, that'd be a little overkill. If you want them to be able to become zombie-like beasts, then I'll do it.
Here are the disease traits:
Sudden and uncontrollable bleeding.
How does it spread?
Mainly airborne, if anyone touches an infected persons blood, they too will become infected. The disease can travel for miles (This is if the wind is right) if not, it has a range of about 4-6 feet.
How fast does it take effect?
About 2-3 days, infected will first have a fever, then swelling and coughing, soon other symptoms will follow.
Sometimes the swelling can burst, spraying contaminated, well, blood and other bodily fluids about 2 feet. This is a rare case, only around 5 in 100 people have this effect.
In a Derikan star system, Octavius Orion inhabits the same disease, and dies in a transport on its way to a major planet (Your choice)
On Amasa and Dwarka, Rothellans have been seen with these traits, no questioning has been raised because of the civil war. On Dwarka, clones and Eclipse soldiers have been taking casualties in the thousands as a result of this disease.