This document discusses several diseases and toxins: H1N1 virus, E. coli bacteria, botulism, and nicotine. It describes the causes and effects of each, as well as prevention methods. H1N1 virus infects cells and forces them to replicate the virus. E. coli is usually harmless but too much can be deadly. Botulism is a rare but serious illness caused by a bacteria that paralyzes muscles. Nicotine is highly addictive and causes various health problems. Prevention includes handwashing, cooking food thoroughly, and avoiding smoking.