When the number of T4 cells drops below what level, symptoms are likely to begin appearing and the person is vulnerable to opportunistic infections and certain tumors?

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When the number of T4 cells (also known as CD4 cells) drops below 200 per cubic millimeter, a person is considered to have progressed to AIDS and is at high risk for opportunistic infections and certain cancers. This threshold is a key indicator used in the clinical diagnosis of AIDS in individuals infected with HIV.

When the Number of T4 Cells Drops Below What Level