Cryptosporidiosis

This study has the purpose to demonstrate prospect of benefit of EDI048 on clinical signs and symptoms of cryptosporidiosis to facilitate trial in target population, pediatric patients. This study aims to investigate the efficacy of a new chemical entity, EDI048, in a controlled human infection model of cryptosporidiosis induced by administration of ABO809 in healthy adults, who become symptomatic with disease thereby demonstrating a prospect of benefit for use of EDI048 in children afflicted with cryptosporidiosis.

The goal of this clinical trial is to learn if nitazoxanide (NTZ) can treat Cryptosporidium infection in children age 6-12 months. The main questions it aims to answer are: * Does NTZ treatment of diarrheal Cryptosporidium infection lower the number of days of diarrhea? * Does NTZ treatment of diarrheal and non-diarrheal Cryptosporidium infection lower the number of days that parasites can be found in the stool? Researchers will compare NTZ to a placebo (a look-alike substance that contains no drug) to see if NTZ works to treat Cryptosporidium. Participants will: * Take NTZ or placebo for 3 days * Receive regular visits from field research assistants * Provide blood and urine samples