[yea its fine if theyre zombies
In Palisade City, an ambulance arrives on scene of a downed man, followed by 2 cop cars. As per protocol, the bus was moved to the side of the magnetic street to keep traffic moving. The police move all the passengers off the bus and to a safe distance away from it. EMTs wearing masks then board the bus to deal with the man. They check him over and decide he's deceased, so they put him in the ambulance.
The other passengers are asked to submit to a test. Most citizens would, but some wouldn't. They weren't forced to participate, though. This test wouldn't work anyway because this is a new disease. After clearing all the citizens, the EMTs get back in the ambulance and drive to a hospital. The man is treated there and eventually resuscitated.