After dividing the cases into three drug use history groups, 5 years or less, 6–10 years, and 11 years and more, a trend test yielded χ 2 = 3.307 and p-value = 0.069, suggesting a strong trend of increasing rate of cryptosporidiosis with the length of drug use.
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Therapeutic effects of acetylspiramycin and garlicin on cryptosporidiosis among drug users.
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