Chicago P.D.

Infection (3) (7x4)

: 16, 2019

After zeroing in on a suspect responsible for bioterrorism, the P.D. prepares to undertake its biggest manhunt yet; Upton is torn between helping track down the perp and providing emotional support to a scared young girl who needs her. (Infection (1) Chicago Fire S08E04) (Infection (2) Chicago Med S05E04)