Single-celled, microscopic organisms which are shaped in circles, rods or spirals. Some bacteria are beneficial to the human body and help to maintain health. Others can be harmful, especially if they overgrow and cause infection.
Single-celled, microscopic organisms which are shaped in circles, rods or spirals. Some bacteria are beneficial to the human body and help to maintain health. Others can be harmful, especially if they overgrow and cause infection.
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