Casualty (1986)

S46E1 In the Line of Duty

A mysterious virus sweeps through Holby, and the team must rise to the challenge. As the infection spreads rapidly, the hospital is pushed to its limits, forcing doctors to battle both the outbreak and their own fears. Personal loyalties are tested as old rivalries resurface under the pressure, while some staff members put everything on the line to find a cure. In the chaos, unexpected heroes emerge, and the race against time reveals just how far each of them is willing to go.