Q fever is an infectious disease of man. It is found as an inapparent infection in animals. Cattle, sheep, and goats are found widely infected in nature and are probably the source of the organisms infecting man. These animals shed the organism in their milk which introduces it into the environment of man. It has been demonstrated that the rickettsiae of Q fever may survive present day pasteurization procedures. This manuscript presents preliminary data of the survival of this organism when suspended in milk and subjected to various time-temperature combinations within the pasteurization range.