fight off/against

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Our body can naturally fight off/against many diseases.

Both fight off and fight against many diseases sound good to me here, but I don't know what differences they make.
If I omit off and against here, fight many diseases still sounds good. Yet, does it change the meaning of the sentence? Thanks.
  • EkatS

    United States/English
    The meanings are different:
    Our body can fight off many deseases = Our body prevents many deseases from ever developing in it.

    Our body can fight (against) many deseases = Our body reacts to the deseases that have already infected it.
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