The species of microorganisms which can grow on commercial viennas on the storage at 10°C were Lactobacillus, Streptococcus and yeasts. When specially made viennas which did not contain preservative in its were used for this investigation, growth of microorganisms such as Lactobacillus, Streptococcus, Micrococcus, Bacillus and yeasts were predominant on the storage at 10°C, and Pseudomonas and molds some time propagated. When smokedviennas specially made for the National Project were used for preservation, growth of microorganisms was consisted mainly of the species of Lactobacillus, Micrococcus, Acinetobacter, Flavobacterium, Streptococcus, Serratia, Corynebaeterium and yeasts. Irradiation of viennas at 300 and 500 krad reduced the aforementioned flora to the Lactobacillus, Streptococcus, Acinetobacter and yeasts. The number of microorganisms on the viennas packed with nitrogen gas was not increased for 3 to 7 days by means of 300 krad irradiation, and extended the storage-life 2 to 3 times. When irradiated with a dose of 500 krad, the number of microorgasnisms was not increased for 9 to 14 days on the storage at 10°C.

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