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About half the world's population carries the protozoan Toxoplasma gondii with few or no long-term consequences. However, in patients with advanced immunodeficiency, T. gondii tissue cysts can become reactivated and cause severe disease, primarily involving the central nervous system. Early in the HIV epidemic, toxoplasmosis was a very common opportunistic infection (OI) in patients with advanced AIDS, but since the advent of prophylaxis and potent antiretroviral therapy (ART), it has become relatively uncommon in the U.S. CDC investigators recently documented this trend, using national data on toxoplasmosis-related hospitalizations in both HIV-positive and HIV-negative individuals.
Among HIV-positive patients, the annual number of toxoplasm…