However the main function of the small intestine is the absorption of the small food particles resulting from digestion. It contains many villi which increase the surface area for absorption. The large intestine moves the material that has not been digested from the small intestine and absorbs water.
Respiratory failure caused by botulism can result in death. About 50 years ago half of all patients with botulism died, compared to just 8% today. Patients with severe symptoms may need a breathing machine, intensive medical and nursing care for several months. Fatigue and shortness of breath may linger for many years.
Botulism is caused by a toxin that affects nerves, and in that sense it is not an infectious disease. The botulism toxin is produced by the bacteria Clostridium botulinum, and is one of the deadliest known toxins. There are 7 different types of botulism toxin labeled A through F. Types C and E are most important in wild birds. While this toxin can also affect humans it is not a zoonotic disease.