Problem to be solved. To provide agents capable of effectively suppressing a cell number of Tyzzerella bacteria, food compositions and an animal feed for suppressing a number of Tyzzerella bacteria. Solution. There is disclosed an agent for suppressing a cell number of Tyzzerella bacteria comprising 1-ketose as an effective ingredient. According to the invention, the cell number of Tyzzerella bacteria can be effectively suppressed thereby preventing Tyzzer's disease. The invention also provides highly safe agents for suppressing the cell number of Tyzzerella bacteria which can be easily blended in various food and drugs or can be ingested daily and simply.

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