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Last updated on April 2, 2025.

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About food poisoning caused by welsh bacteria

Food poisoning due to Weersh bacteria is increasing. Be careful of points such as eating immediately after cooking and cooling immediately when storing, and thoroughly prevent food poisoning.

What is Weersh bacteria?

Weersh bacteria are widely distributed in nature, such as the intestinal tract, soil, and water of humans and animals, and are also attached to meat, seafood, and vegetables. Because it takes the form of heat-resistant spores, it survives even at high temperatures without death.

Food poisoning caused by Weersh bacteria

Hiding time

Approx. 6 to 18 hours (average 10 hours)

Main symptoms

Abdominal pain, diarrhea, etc.

Example of causative food

・Stewed dishes using meat, seafood, vegetables, etc.

・Bento made with boiled food

・Foods that have been cooked in large quantities, such as curry, stew, and soups, and have been cooled at room temperature in pots.

Cause

Food poisoning caused by Weersh bacteria is caused by eating foods that have grown in large quantities of Weersh bacteria.

Image of conditions for increasing the number of welsh bacteria

The spores-like Weersh bacteria survive even when heated. If left at room temperature after cooking and the temperature of the food drops to about 45 ° C, weersh bacteria emerge from the shell of the spores and begin to grow rapidly. Under conditions preferred by Weersh bacteria (oxic-free, 43-45 ° C), the bacteria double every 10 minutes, and only one Weersh bacteria multiply into the amount of bacteria that cause food poisoning after 3 hours and 40 minutes. Care must be taken to prevent bacteria from growing.

Points of Prevention

・Avoid cooking the day before and eat as soon as possible after cooking.
・When a large amount of food is cooked at a time, do not leave it at room temperature.
・If it is unavoidable to store it, cool it down quickly by subdivide it.
・When reheating curry, etc., mix well, heat the whole well, and eat as soon as possible.
・When using the insulation equipment, keep track of the temperature difference between the upper and lower levels, the foreground and the back, etc.

Handbill

Video

[Weersh bacteria food poisoning is occurring due to uneven temperature of the heat insulation equipment! (YouTube video)
Do you know the temperature unevenness of the insulation equipment?
In this video, we explain the verification that reproduces the risk of food poisoning due to the occurrence of uneven temperature.
Double-check your current operation to ensure proper temperature control at your facility!

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Inquiries to this page

Food and Hygiene Division, Medical Care Bureau Health and Safety Department

Phone: 045-671-2460

Phone: 045-671-2460

Fax: 045-550-3587

E-Mail address ir-syokuhineisei@city.yokohama.lg.jp

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Page ID: 248-090-834

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