HIV (human immunodeficiency virus) is a virus that attacks the immune system. The immune system becomes weaker, making it harder for the body to fight off infections and some kinds of cancers. Most people who are diagnosed early and take medicines for HIV can live long, healthy lives.
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Microorganisms and all other living organisms are classified as prokaryotes or eukaryotes. Viruses are considered neither prokaryotes nor eukaryotes because they lack the characteristics of living things, except the ability to replicate.
