Botulism is a rare neuroparalytic disease caused by neurotoxins of Clostridium species. A tenyear-old girl and her mother were admitted to a hospital with symptoms of progressive dizziness, blurred vision, slurred speech, constipation and difficulty in swallowing. These characteristic manifestations and clinical course prompted an examination of the possibility of botulism. Mouse bioassay performed with mother’s stool demonstrated type A botulinum toxin and culture of the mother’s stool was positive for Clostridium botulinum type A. This is the first case of botulism in Korea. (Korean J Clin Microbiol 2003;6(2):160-163)