A plague is an outbreak of an infectious disease that affects people over an extensive geographical area, otherwise known as a pandemic. There are also specific infectious diseases that are given the name plague.
Some examples of such diseases include the following:
- Telurian plague (ENT: "Cold Station 12" and TNG: "A Matter of Time")
- Terrellian plague (ENT: "Singularity" and VOY: "Message in a Bottle")
- Phyrox plague (TNG: "Allegiance")
- Plasma plague (TNG: "The Child")