Final answer:
Blurred vision, weakness, and difficulty speaking and breathing are symptoms of botulism, a severe form of food poisoning caused by toxins produced by the bacterium Clostridium botulinum.
Step-by-step explanation:
Blurred vision, weakness, and difficulty speaking and breathing are symptoms of botulism, which is a severe form of food poisoning. Botulism is caused by toxins produced by the bacterium Clostridium botulinum. These toxins can affect the nervous system and lead to muscle paralysis, including the muscles responsible for vision, speech, and breathing.