Officials in Namwon City, in the south-west of the country, announced on Friday morning that there had been 996 confirmed cases - although local media reports say that number had climbed to 1,024 by early Saturday afternoon.
Authorities said the popular fermented cabbage dish had been distributed to those now sick through school meals in the city.
They added that students and staff from 24 schools were among the patients with vomiting, diarrhoea and abdominal pains.
Disaster and safety department had temporarily suspended the production and sale of any products from the company that made the kimchi - which is also in the process of voluntarily recalling products that have already been distributed. The firm that produced the kimchi has not yet been officially named.