In which condition does the CD_4 count in the | vedclass

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(B) $AIDS$ (Acquired Immuno Deficiency Syndrome) is caused by the Human Immunodeficiency Virus $(HIV)$.$HIV$ specifically targets and infects $CD_4^+$

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$AIDS$

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(B) $AIDS$ (Acquired Immuno Deficiency Syndrome) is caused by the Human Immunodeficiency Virus $(HIV)$.$HIV$ specifically targets and infects $CD_4^+$ $T$-helper lymphocytes.As the infection progresses,the number of these $CD_4^+$ cells significantly decreases.$A$ $CD_4$ count of less than $200 	imes 10^{6}$ cells/$L$ (or $200$ cells/mm$^3$) is a clinical marker used to define the progression of $HIV$ infection to the stage of $AIDS$.

In which condition does the $CD_4$ count in the blood fall below $200 \times 10^{6}$ cells/$L$?

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