Giardia intestinalis is the cause of both epidemic and endemic diarrhea and upset of the gastrointestinal system. There are a number of drugs whose efficacies are well studied and that have been accepted for the treatment of patients with this infection. However, some individuals experience treatment failure, despite having received successive courses of treatment that have been documented to result in a cure for most patients. Nitazoxanide has been reported to be effective against a broad range of parasites, including G. intestinalis. In this case, we present a case of drug resistance G. intestinalis treated with nitazoxanide.
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