2007 United Kingdom foot-and-mouth outbreak
The 2007 United Kingdom foot-and-mouth outbreak occurred when the discharge of infectious effluent from a laboratory in Surrey led to foot-and-mouth disease (FMD) infections at four nearby farms. The infections were detected via regular livestock testing by the Department for Environment, Food and Rural Affairs (Defra).
Source: Wikipedia — 2007 United Kingdom foot-and-mouth outbreak (CC BY-SA 4.0)