M*A*S*H - Season 1 - Eps 11: Germ Warfare
Hawkeye moves a wounded North Korean soldier into The Swamp, rather than let him be shipped out before he's stable. During the night he and Trapper play Dracula, and siphon off a pint of Frank's blood. The soldier then contracts hepatitis, so they have to test Frank without him knowing, and have to keep him away from Margaret and the patients.
About M*A*S*H

Title: M*A*S*H
First Air Date: 1972-09-17
Last Air Date: 1983-02-28
Status: Ended
Rating: 7.9/10 (from 670 votes)
Language: EN
Seasons: 11
Total Episodes: 251
Network: CBS
Genres: War & Politics, Drama, Comedy
Production Companies: 20th Century Fox Television
Synopsis
The 4077th Mobile Army Surgical Hospital is stuck in the middle of the Korean war. With little help from the circumstances they find themselves in, they are forced to make their own fun. Fond of practical jokes and revenge, the doctors, nurses, administrators, and soldiers often find ways of making wartime life bearable.
Cast

Alan Alda
Hawkeye Pierce

Mike Farrell
B. J. Hunnicutt

Harry Morgan
Sherman Potter

Loretta Swit
Margaret Houlihan

David Ogden Stiers
Charles Winchester

Jamie Farr
Maxwell Klinger

William Christopher
Father Mulcahy