2 Answers

ClicheName · Answer 1 · 2017-07-29T11:55:22+0000

They go into your body and harm many organs.
This causes damage.
Pathogens are usually what make you sick.
They can be viruses, bacteria, etc.

AllanLRH · Answer 2 · 2017-08-01T15:59:24+0000

Once you are infected bacteria grow and reproduce inside the cells of your body. As they grow and divide, many bacteria make toxins. These toxins can damage your cells.

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