DiscussionThe incidence of giardiasis in housed infants with diarrhoea (3%) was low; the higher incidence in itinerant infants (12 %) was Case report This Japanese boy was 11 years when he first visited our clinic. Family history was not remarkable. He had been the product of a term, uncomplicated pregnancy and had weighed 2 -9 kg at birth. Labour and delivery had been normal. He had attained all the early motor milestones at the appropriate ages and walked at 15 months. At 3 years it was noticed that his gait was waddling and wide-based; he could not run or jump as other children. He was admitted to a hospital with suspected muscular dystrophy. At 4 years bilateral inguinal hernias were repaired. At 10 years he began to complain of pains in the legs. At 11 he was admitted to hospital because of muscular weakness and wasting, and because he tired easily; he had difficulty in climbing stairs and could not lift heavy objects above his head.He was then a slender boy with an excessive lumbar lordosis; height was 133 3 cm (-1 SD) and weight 20-1 kg (-2 5 SD). Blood pressure was