HIV (Human Immunodeficiency Virus) is a virus that attacks your immune system, specifically targeting CD4 cells (T cells), which are crucial for fighting off infections. If not treated, HIV can lead to AIDS (Acquired Immunodeficiency Syndrome), a condition in which the immune system is severely weakened, making the body more vulnerable to infections and diseases.
So, the correct description from your options is:
A virus that attacks your immune system so that it can't fight off pathogens.
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