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Firstly, many bacteria are pathoges, and so can directly cause disease. For example, the bacteria known as Salmonella causes food poisoning.

Secondly, bacteia compete with us for food, and so tend to eat the food which we eat, there by making it unedible for us.

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12y ago
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4mo ago

Bacteria can negatively affect humans by causing infections, such as strep throat or urinary tract infections, which can result in illness or discomfort. Some bacteria can also produce toxins that can lead to food poisoning or other harmful effects when consumed.

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12y ago

They can cause infection or poison(salmonella)...

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13y ago

1. you may get sick

2. IT affects your body weight

3.Can cause diseases

Bacteria still keeps us living healthy because it is critical for our digestion.

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11y ago

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Q: What are two ways bacteria can negatively affect humans?
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