eMedicine Specialties > Pediatrics: General Medicine > Allergy & Immunology
Delayed-type Hypersensitivity: Follow-up
Updated: Jun 2, 2009
Follow-up
Further Inpatient Care
- Consider patients with most T-cell disorders for stem cell transplantation, usually by bone marrow transplantation using an major histocompatibility complex (MHC)-matched related or unrelated donor.
- Only a few cases of bone marrow transplantation (BMT) have been reported in patients with mutations in the interferon (IFN)-g and interleukin (IL)-12/IL-23 signaling pathways with rather unfavorable results. Intact T-cell functions other than IFN-g/IL-12/IL-23 axis increases the risk of graft rejection and concurrent atypical mycobacterial infection usually present at the time of BMT may increase the risk of post-BMT complications.9,10
Further Outpatient Care
- See Medical Care and Medication.
Inpatient & Outpatient Medications
- See Medical Care and Medication.
Deterrence/Prevention
- Patients in whom cell-mediated immunodeficiency diseases are suspected should never receive the bacille Calmette-Guérin (BCG) or smallpox vaccine. Similarly, the measles, mumps, rubella (MMR) vaccine is contraindicated, although this vaccine is not administered until age 1 year, by which time most T-cell disorders have been diagnosed. Guidelines regarding the administration of the MMR vaccine have been updated.11
- Patients with IFNGR1, IFNGR2, STAT-1, IL12P40, or IL12RB1 mutations are advised to receive prophylaxis against nontuberculosis mycobacteria (NTM) using rifabutin and clarithromycin.
Complications
- Antigens that are currently available for delayed-type hypersensitivity (DTH) skin testing are not associated with significant morbidity and do not cause mortality.
- Experimental animal models of immunodeficiency with absent delayed-type hypersensitivity suggest that other infections may also occur in the absence of effective cell-mediated immunity (CMI). These infections include L monocytogenes, L pneumophila, T gondii, and Leishmania species.
- In humans with idiopathic disseminated BCG or mutations in the IFN-γ signaling pathway, the risk of contracting nontyphus Salmonella infections increases.
- One report describes severe infections with viruses (eg, respiratory syncytial virus [RSV], parainfluenza virus, herpes simplex virus (HSV), cytomegalovirus [CMV], and varicella-zoster virus [VZV]) in a patient with an IFN-γ signaling pathway defect.
- Some patients with IFNGR1 mutations have antibody responses to HSV, CMV, VZV, and Epstein-Barr virus (EBV) without clinical infection, suggesting that their host response to these viruses is intact.
Prognosis
- Adequate nourishment and discontinuation of drug therapy can reverse anergy caused by malnutrition and immunosuppression by immunomodulating agents, respectively.
- As noted in Mortality/Morbidity, severe mutations in IFNGR1, IFNGR2, STAT-1, IL12P40, and IL12RB1 lead to lethal disseminated infections with NTM. Mutations in the IFN-g signaling pathway that cause milder clinical infections are described; many of these patients benefit from exogenous IFN-g therapy.
Patient Education
- Regarding IFNGR1, IFNGR2, STAT-1, IL12P40, and IL12RB1 mutations, inform families about the risks of infection so that appropriate steps to avoid exposure to infection are instituted.
- Families should be aware that BCG and live viral vaccines are contraindicated.
- Genetic counseling is an essential part of medical care for the family. Inform parents of the 1 out of 4 risk for affected infants in autosomal recessive gene mutations. Mutations in the intracytoplasmic domain of IFNGR1 result in autosomal dominant transmission.
- If bone marrow transplantation is considered a therapeutic option, an adequate informed consent consultation for stem cell reconstitution must include the high risk for life-threatening infection during the preparative immunosuppressive regimen in addition to the risk for failure to engraft and graft versus host disease (GVHD). Although successful complete immune reconstitution from bone marrow transplantation can be obtained using fully matched related and unrelated donors, patients may not engraft or may experience GVHD posttransplant. Other forms of stem cell reconstitution that can be offered include cord cell transplantation. Gene therapy is expected to be an option in the future.
- The Immune Deficiency Foundation is an important resource for education and for support for patients and families with any primary immunodeficiency disease. The current address is 40 W. Chesapeake Ave, Suite 308, Towson, MD 21204. Some states have local chapters.
- The Jeffrey Modell Foundation at 747 Third Avenue, New York, NY 10017 provides support and raises funds.
- For excellent patient education resources, visit eMedicine's Allergy Center.
Miscellaneous
Medicolegal Pitfalls
- Failure to investigate cell-mediated immunity in patients with disseminated bacille Calmette-Guérin (BCG), nontuberculosis mycobacteria (NTM), or unusually severe candidal infections raises the specter of legal liability. Look for a clinical history of consanguinity and other family members with similar clinical infections.
- Offer mutational analysis for suspected T-cell defects and discuss the opportunity for prenatal diagnosis with the family. Any autosomal recessive mutation places siblings at a 1 out of 4 risk. An autosomal dominant mutation results in a 1 out of 2 risk.
Special Concerns
- BCG is commonly administered to infants at birth or in the first 3 months of life in some countries but not in the United States; it is contraindicated when T-cell disorders are suspected.
- Infections with T gondii and Leishmania species and fungal infections, such as coccidioidomycosis and histoplasma, are theoretical risks for patients with primary immunodeficiencies involving the IFN-g/IL-12/IL-23 signaling pathway, including those with IFNGR1, IFNGR2, STAT-1, IL-12P40, and IL12R mutations.
The authors and editors of eMedicine gratefully acknowledge the contributions of previous author Ann O'Neill Shigeoka, MD, to the original writing and development of this article.
More on Delayed-type Hypersensitivity |
| Overview: Delayed-type Hypersensitivity |
| Differential Diagnoses & Workup: Delayed-type Hypersensitivity |
| Treatment & Medication: Delayed-type Hypersensitivity |
Follow-up: Delayed-type Hypersensitivity |
| References |
| « Previous Page |
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Further Reading
Keywords
delayed-type hypersensitivity, DTH, DTH reaction, DTH response, delayed-type hypersensitivity reaction, delayed type hypersensitivity, delayed hypersensitivity, hypersensitive response, hypersensitive reaction, cell mediated immunity, CMI, antigen-presenting cells, APCs, cell-mediated immunity to recall antigens, anergy, anergic reaction, T cell, T-cell receptor, Candida antigen, Candida infection, DTH skin test, T-cell disorder, T-cell defect, bone marrow transplantation, BMT
Mycobacterium tuberculosis, tetanus, Candida, Trichophyton, mumps, contact hypersensitivity, nickel, dinitrochlorobenzene, DNCB, picryl chloride, leprosy, poison ivy, Listeria monocytogenes, Legionella pneumophila, Toxoplasma gondii, Leishmania, lymphocytic choriomeningitis virus, mouse hepatitis virus, herpes simplex virus, HSV, malnutrition, atopic dermatitis, MMR vaccine, sarcoidosis, mononucleosis, HIV, influenza, malignant lymphomas, severe combined immunodeficiency, SCID, cytomegalovirus, CMV, Hodgkin lymphoma, asthma, atopy, glomerulonephritis, treatment, diagnosis
Follow-up: Delayed-type Hypersensitivity