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X4-Tropic Virus
           Also known as T-tropic virus. A strain of HIV that uses the
           chemokine receptor CXCR4 as a coreceptor to bind to and infect
           human immune cells. Although some HIV-1 strains are X4-tropic
           from the beginning of infection, it is more common for the virus to
           switch to using the CXCR4 coreceptor as the disease progresses.
           See Also:  R5-Tropic Virus
                    Chemokines
                    Coreceptor
                    CXCR4


        XDR-TB
           See: Extensively Drug-Resistant Tuberculosis





































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