- The bacterium found in home canned and bottled vegetables which causes botulism. The spores of this organism are not killed by cooking at normal temperatures. The incubation period is 18 to 36 hours and death occurs in 1 to 8 days or there is a slow recovery lasting 6 to 8 months. The symptoms are disturbance of vision, dry mucous membranes of the mouth, tongue and pharynx, which cause difficulty in speaking and swallowing, and progressive weakness and respiratory failure. Immediate medical attention should be sought if there is any suspicion of the condition.