Since the poisoning outbreak in the city of Blagodarny, 75 children of pre-school age have been admitted to hospital along with one adult, the emergencies service said.
A preliminary probe revealed that a single businessman supplied food to all the kindergartens affected, but it is unclear whether his products were the source of the poisoning.
The incident follows a number of mass food poisoning cases at children's camps throughout Russia this summer.
In northwest Russia's Novgorod Region about 120 children and adults were infected with an intestinal bug earlier this week. In late June in the Sverdlovsk Region, in the Urals, about 40 people, including 33 children, were hospitalized with acute intestinal infection. In the same month, dysentery led to the hospitalization of 93 children and two adults at two summer camps in the Moscow Region.
