Do not require therapy
Alternative diagnoses should be considered and excluded (e.g. alternative pathogen, noninfectious cause of symptoms)
Initiation of treatment in symptomatic patients is controversial<unk>  infection is often self-limiting and many mild cases will resolve quickly
Treatment options:
Metronidazole (750 mg TID for 5-10 days) 
Tinidazole (2 mg once)
Alternatives include: paromomycin, nitazoxanide, and trimethoprim-sulfamethoxazole
Metronidazole (750 mg TID for 5-10 days) 
Tinidazole (2 mg once)
Alternatives include: paromomycin, nitazoxanide, and trimethoprim-sulfamethoxazole
Blastocystis species
Viral 
Cryptosporidium
Bacterial
Cyclospora
Campylobacter
Eikenella
Shigella