Infection

Infection is a 2004 Japanese horror film directed by Masayuki Ochiai. The film is about a run-down hospital where a doctor's mistake unwittingly creates horrific consequences for the staff at the hospital. The film was adapted from Ochiai's earlier screenplay from Tales of the Unusual. On its release, the film was part of the six-volume J-Horror Theater series.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.