The Discovery of Giardia 1

摘要: is normally self-limiting. Human gia-rdiasis can be divided into two disease phases: acuteand chronic. The acute phase usually short-lived,characterised by flatulence with sometimes sulphur-ous belching and abdominal distension cramps.Diarrhoea initially frequent watery but laterbecomes bulky, frothy, greasy offen-sive. gas may cause the stools to float.In chronic giardiasis, malaise, weight loss andother features of malabsorption become prominent andstools are pale or yellow, smallvolume. Malabsorption vitamins D-xylose canoccur, while disaccharidase deficiencies (most com-monly lactase) frequently detected in cases.In young children, ‘failure thrive’ dueto all infants being investigated forcauses should have a diagnosis ofgiardiasis excluded (2).The parasite exists distinct morphologicalforms. reproductive trophozoite whichparasitizes cells lining upper small intestine.There also resistant, resting phase, an environ-mentally-resistant cyst which voided faeces.This infective disseminating stage.