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1.some bacteria cause diseases to human.Example is Salmonella typh i(typhoid fever) .

2.The toxins of many pathogenic bacteria that are transmitted in foods can cause food poisoning when ingested. These include a toxin produced by Staphylococcus aureus, which causes a rapid, severe, but limited gastrointestinal distress, or the toxin of Clostridium botulinum, which is often lethal. Production of botulism toxin can occur in canned nonacidic foods that have been incompletely cooked before sealing.

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Q: What is the role of bacteria in human life?
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