In some scenes, the door indicators show red for locked, in others they show green.
The Peace keepers say the virus will produce its spores when it stays enough time in a body, but viruses don't use spores to reproduce.
Toward the end of the episode, when Pilot is closing the access points to the tier they are on, you can see a hand on the far left pushing the door shut.
John mimics the accent of the Peacekeepers in order to pass as a Sebacian, but since everyone is hearing him via the translator microbes this would have no effect.