The Unknown Infection, or ‘Rožňava Disease’ in Czechoslovakia in 1951

This article analyses the scientific and ideological impact of the 1951 tick-borne encephalitis epidemic in Rožňava (Czechoslovakia). Scientists in Rožňava discovered the possibility of transmission of the tick-borne encephalitis virus through non-pasteurised milk. The article focuses on both the outbreak in Rožňava, with its social and ideological implications, and the subsequent virological research, which became a means of prestige and symbolic power for Czechoslovak scientists within the domestic and international scientific community. The article shows that an epidemic can become a tool of power. The Rožňava epidemic, although now forgotten, helped establish the institutional background for virological research in Czechoslovakia and was at the origin of the still cutting-edge knowledge of tick-borne encephalitis.