Can rehydrated dried shiitake mushrooms be kept in the refrigerator for several days and still be safe to eat?

Rehydrated dried shiitake mushrooms should not be stored in the refrigerator for more than 24 hours and must not be consumed thereafter.

If rehydrated dried shiitake mushrooms are refrigerated for too long, they may develop a slimy film on their surface or emit an off-odor. At this point, their texture and palatability deteriorate significantly, their nutritional value declines due to refrigeration, and harmful bacteria and microorganisms may proliferate. Consequently, rehydrated shiitake mushrooms spoil easily; accidental consumption may irritate the gastrointestinal mucosa, triggering acute gastrointestinal disorders—such as nausea, vomiting, and diarrhea. Prompt medical attention is advised; treatment—including oral administration of smectite powder or gastric lavage—should be undertaken per physician instructions to prevent disease progression.

Shiitake mushrooms belong to the fungal kingdom and are prized for their rich umami flavor, delicate texture, and distinctive aroma. They also possess both high nutritional value and medicinal properties; moderate consumption confers health benefits.