Immunohistopathological status of the skin in cases infested with three species of mites.

This study was performed on eighty patients with clinical manifestations of scabies. Sarcoptes scabiei adult or larva was isolated from 39 patients (48.8%). Dermanyssus gallinae (red poultry mite) and Dermatophagoides sp. were isolated from 6 and 5 patients respectively. Punch biopsies were taken from the patients, stained with haematoxylin and eosin and direct immunofluorescence stain to study the immunopathological status of the skin infested with three species of mites. The results declared that the pathological changes and the immunoglobulin deposition in the skin were nearly similar regardless of the type of the causative mite with the except of the presence of burrows in Sarcoptes scabiei.

Immunological and histopathological study on splenectomized mice infected with Giardia lamblia.

This study was carried out on sixty mice which were allocated in two group. Group I: included thirty mice which were splenectomized and orally inoculated with Giardia lamblia cysts. Group II: thirty intact infected mice which served as a control group. The mice in group I captured G. lamblia infection and demonstrated trophozoites in their intestinal sections when PAS (periodic acid Schiff) and IIF (indirect immunofluorescence) stains. On the other hand, intestinal sections stained with hematoxyline and eosin showed a spectrum of pathological changes with shortened fused villi, heavy lymphocytic infiltration in the lamina propria and atrophy in musculosa and ganglion cells which showed decrease in number per base of villus. The levels of antibody response measured with IIF-test showed significant decrease in group I compared with the control group. This study demonstrated the role of humoral immunity in infection with G. lamblia.