Bacteria are living things with only a single cell that can reproduce quickly. There are millions of bacteria that live all around us - in soil or water and on surfaces in our homes and workplace 

There are even millions of bacteria that live on your skin and inside of your body.

Most bacteria aren't harmful and many are even helpful.They can help you digest food and kill off other harmful forms of bacteria that try to invade your body.

But even the helpful ones can hurt you if they grow where they're not supposed to.

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