HIV-infected patients might be at risk for Cryptosporidium parvum infection from their drinking water — even if the water is treated at state-of-the-art facilities, according to a study in the March 1, 1996, Annals of Internal Medicine.

In Clark County, Nev. (Las Vegas), three cryptosporidiosis cases were documented in 1992 (the first year data were collected), 23 cases in 1993 and 78 in the first quarter of 1994.

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