- Previous episode S08E03 - Badlands
- Number S08E04
- Director Reza Tabrizi
- Writers Dick Wolf, Derek Haas
A rare but deadly bacteria takes its toll on numerous victims around the city, leaving Chicago’s finest first responders to work together alongside the CDC to resolve the dangerous situation. Following a fire at a local university that ties into the outbreak, Severide has suspicions that something bigger is happening.