Blue Flu (Brooklyn Nine-Nine)

"Blue Flu" is the 3rd episode of the eighth season of the American television police sitcom series Brooklyn Nine-Nine, and the 146th overall episode of the series. The episode was written by co-executive producer Carol Kolb and April Quioh and directed by Claire Scanlon. It aired on August 19, 2021 on NBC, airing back-to-back with the follow-up episode, "Balancing".

The show revolves around the fictitious 99th precinct of the New York Police Department in Brooklyn and the officers and detectives that work in the precinct. In this episode, the Patrolmen's Benevolent Association engineers a walkout of uniformed officers in response to an alleged anti-cop incident, and Holt and Amy are left to manage a short-staffed precinct. During the mission, Boyle gets worrisome medical news while gathering evidence.

According to Nielsen Media Research, the episode was seen by an estimated 2.01 million household viewers and gained a 0.4 ratings share among adults aged 18–49. The episode received positive reviews from critics, who praised the cast, particularly Braugher's and Lo Truglio's performances.