Professor Shigeru Kyuwa
Department of Biomedical Science,
Graduate School of Agriculture and Life Science,
University of Tokyo
Demonstration of the suppression effect against norovirus
Department of Biomedical Science, Graduate School of Agriculture and Life Science, the University of Tokyo
Use mouse norovirus [Mouse norovirus] (1) Virus belonging to the genus Calicivirus Norovirus (single-stranded RNA virus, plus sense, no envelope). (2) A related virus that belongs to the same virus genus as human norovirus and may be used as a substitute for human norovirus. (3) Increase in mouse macrophage-like tumor cell line RAW264 cells. The MNV-S7 strain (Genbank accession no. AB435515, Toya etc.) used in this experiment was expanded with the above RAW264 cells (purchased from RIKEN BRC Cell Bank). D-MEM/Ham's F-12 (containing phenol red, HEPES, sodium pyruvate) was used as the culture solution. The virus titer was determined by the TDIDT50 method using a 96-well plate.
The survival rate of norovirus after 4 hours of Streamer irradiation was 0.6% for two units operation compared to 1.3% for one unit operation, confirming approximately twice the suppression effect.
* The results are obtained from demonstration of solely the Daikin Streamer discharge device in an experimental condition.
Be cautious for norovirus in the winter!
Bacterial food poisoning is more common in the summer, when fungi are more prone to grow, but since viruses prefer low temperatures and dry environments, viral food poisoning increases in winter. Among them, the overwhelming majority is food poisoning due to norovirus. Norovirus is extremely infectious and often spreads at a stretch, resulting in more outbreaks and cases than in the summer.