Report titled Preliminary Report of Studies on the Heat Inactivation of Factor IX Freeze Dried in the Presence of Virus Markers - Virus Studies. It discusses spiking Factor IX with viruses and ways to inactivate the viruses, results and comments. Annexed are tables titled Dilution of polio virus in Factor IX, Effect of freeze drying in the presence of Factor IX on polio virus infectivity, Effect of heating on infectivity of polio virus freeze dried in the presence of Factor IX, Effect of heating on infectivity of polio virus freeze dried in the presence of Factor IX, Effect of heating on infectivity of polio virus freeze dried in the presence of Factor IX. Annexed are charts titled freeze-drying of Factor IX and polio temperature/time charts, Effect of heating on infectivity of polio virus freeze-dried in the presence of Factor IX, Effect of heating on infectivity of polio virus freeze-dried in the presence of Factor IX.