title: Unraveling how Giardia infections cause disease.
abstract: A 40-year-old NIH male scientist camped and fished in a remote lake in Alaska. On his return, he developed diarrhea, cramps, and loose stools without blood or mucus in the absence of fever and was diagnosed with giardiasis. A 3-year-old female living in the Florida Keys complained of intermittent stomachaches over a 2-month period. Her stools were variably loose. The patient was diagnosed with giardiasis, which led to examination of her mother, father, and brother, who were mildly symptomatic; all 3 were subsequently diagnosed with giardiasis. The child's only exposure was from swimming in a local community pool. A 40-year-old male from Mexico, who resided in Virginia and worked as a cook in a fast food restaurant, was diagnosed with giardiasis. He denied any symptoms and was not allowed to prepare food. Treatment with metronidazole, nitazoxanide, and albendazole failed to eradicate the infection. He was successfully treated with the combination of paromomycin and metronidazole.
authors.affiliation: Gastrointestinal Parasites Section, Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, NIH, Bethesda, Maryland 20892, USA. tnash@niaid.nih.gov
authors.forename: Theodore E
authors.initials: TE
authors.lastname: Nash
mesh_terms: D000328:Adult; D000818:Animals; D000977:Antiparasitic Agents / Q000494:pharmacology / Q000627:therapeutic use*; D002675:Child, Preschool; D003967:Diarrhea / Q000188:drug therapy / Q000235:genetics / Q000469:parasitology; D004195:Disease Models, Animal; D004351:Drug Resistance; D004359:Drug Therapy, Combination; D005260:Female; D016829:Giardia lamblia / Q000502:physiology*; D005873:Giardiasis / Q000188:drug therapy* / Q000235:genetics / Q000469:parasitology; D006790:Host-Parasite Interactions; D006801:Humans; D008297:Male; D051379:Mice
chemical_list: D000977:Antiparasitic Agents