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Which one is correct?

Immune system fights tumor and infection. Immune system fights against tumor and infection.

Thanks!

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    Both are correct: the former is a transitive usage of the verb fight, and the latter an intransitive usage. There isn't a significant difference between the two in this case. – user405662 May 4 at 15:36
  • ...except you should probably have a definite article there. – Cascabel May 4 at 15:37
  • Yes, the immune system. – user405662 May 4 at 15:39
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    I agree with @user405662. Both are correct and "the" needs to appear before "immune system." I'd also like to add that "tumor" isn't a noncount noun like "infection" is, so you need to either write "tumors" if you are speaking generally or write "the tumor" if not speaking generally but speaking specifically about a certain case or incidence. – Benjamin Harman May 4 at 17:27
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    @user405662: It could mean that. Eating kale every day fights against [fights off] cancer. – Tinfoil Hat 2 days ago

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