Clinical studies in adults presenting with giardiasis to a gastro-intestinal unit.

Eight adults presenting with giardiasis to a gastrointestinal unit during a two year period were studied in detail. Symptoms were varied, diarrhoea occurring in only five patients. Four of the eight gave a history of travel to endemic zones, and three of those who gave no such history had possible predisposing conditions (gastric surgery (2), and borderline IgA deficiency (1]. Most patients exhibited mild malabsorption of fat and vitamin B12, and some abnormality of jejunal disaccharidases was usual. Jejunal histology varied from normal to partial villous atrophy, and the intraepithelial lymphocyte count was raised in those patients with the most marked histological abnormality. Treatment with metronidazole was uniformly successful, and most of the above abnormalities reverted to normal within a month of treatment.