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Results for “Hypersensitivity, Delayed”

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At least 451 records · Page 25Linked to original sources
PubMed1981

A simplified in vitro assay of delayed hypersensitivity in diagnosis of dermatomycoses.

A tissue culture technique for detection of cellular hypersensitivity in an animal model of dermatomycoses is presented. It is based on specific inhibition of migration of leukocytes sensitized to dermatophytic antigens. The application and specificity of this new immunological technique were studied in guinea pigs infected with Trichophyton rubrum, Microsporum vanbreuseghemii, and Epidermophyton floccosum. In all the infected animals, sensitivity to trichophytin was demonstrated to be independent of the clinical disease phase. The in vivo skin-test reactions were common to those of the group of dermatophytes and did not distinguish between the different species. A statistical difference was observed in the leukocyte migration indices of sensitized cells to the homologous and the heterologous antigens of these pathogens (p less than 0.05, Student's test). It is concluded that the leukocyte migration inhibition assay provides a specific expression of cellular hypersensitivity and may be considered suitable for investigation of cellular immunity in vitro in clinical diagnosis or research. This is a simple, rapid, and inexpensive technique that requires small volumes of peripheral blood.

Animals↗
PubMed1985

Immunomodulatory activity of anti-atherogenic drugs: effects on blastogenesis, humoral response, delayed hypersensitivity and passive anaphylaxis by immune complexes.

The effect of several anti-atherogenic drugs (ticlopidine, nicotinic acid and etofibrate) on immune responses and immune complex anaphylaxis has been studied in mice. All the drugs enhanced the activation by concanavalin A, phytohemagglutinin, and lipopolysaccharide of lymphocytes taken from treated animals. Contact hypersensitivity to trinitrochlorobenzene was inhibited by similar treatments with the same drugs, possibly through inhibition of the efferent phase of the reaction. Nicotinic acid produced a slight enhancement of antibody responses to sheep erythrocytes, whereas etofibrate inhibited the response at the highest dose studied. In addition, treatment with these drugs variably protected the mice from anaphylactic shocks induced by immune complexes. Marked protection was also observed using the antiserotoninic, cyproheptadine. These results indicate that drugs used to prevent atherogenic processes modulate different proliferative and effector immunological reactions.

Anaphylaxis↗
PubMed1983

Inhibition of delayed hypersensitivity reaction in mice by cadmium.

The effect of a single exposure to Cd on DH was studied through exposure to Cd at different time intervals in relation to antigen administration. Exposure to Cd significantly suppressed the DH reaction, with a dose-response relationship, when administered 2 or 3 days after immunization of BALB/c and DBA/2 mice with sheep red blood cells. A strain difference in sensitivity to Cd was also demonstrated. These results suggest that a single exposure to Cd impairs the cellular immune response in mice.

Animals↗
PubMed2004

Persistent itching nodules after the fourth dose of diphtheria-tetanus toxoid vaccines without evidence of delayed hypersensitivity to aluminium.

Studies in Gothenburg, Sweden, reported an exceptionally high rate of persistent itching nodules at the site of injection of aluminium containing vaccines, usually with positive epicutaneous tests to aluminium. When a new booster diphtheria-tetanus vaccine was introduced we performed a prospective cluster randomised active surveillance in 25,232 10-year-olds. Parental reports 6 months after vaccination with Duplex or diTeBooster were collected for 22,365 (88%) pupils in 851 schools. We identified 3-6 children per 10,000 with a local itching nodule persisting for at least 2 months. There were no significant differences between the vaccine groups. Contact allergy to aluminium was not detected. The findings support the use of the vaccine presently available in the Swedish vaccination program. Continued surveillance of persistent itching nodules and aluminium contact allergy is, however, warranted for vaccines containing pertussis toxoid and aluminium.

Adjuvants, Immunologic↗