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Onset within minutes
cross-linking of IgE on mast cells
anaphylaxis, angioedema, urticaria
treat with epinephrine and steroids
Type I Hypersensitivity
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Onset within hours
cytotoxic antibody
hemolytic anemia
Type II Hypersensitivity
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Onset within hours
Immune complex deposition with activation of complement
Serum sickness (fever, urticaria, arthritis)
Low C3, C4, proteinuria
treat with antihistamines, NSAIDs or prednisone
Type III Hypersensitivity
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Onset within days
T-cell mediated
Contact dermatitis
Type IV Hypersensitivity
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FPIES
bloody diarrhea or profuse diarrhea
usually due to soy or milk protein
diagnose with double blind placebo-controlled food challenge
Food protein-induced enterocolitis syndrome
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Vaccines to avoid if egg allergic
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4 Allergic causes of eosinophilia
- allergic rhinits
- eczema
- asthma
- drug allergy
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Endocrine causes of eosinophilia
adrenal insufficiency
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3. Infectious causes of eosinophilia
- parasitic
- mycobacterial
- fungal
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5 Immune dysfunction causes of eosinophilia
- IBD
- SLE
- Churg-Strauss syndrome
- Omenn syndrome
- hyper-IgI syndrome
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4 Neoplastic causes of eosinophilia
- AML
- ALL
- lymphoma
- mastocytoma
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3 Idiopathic causes of eosinophilia
- hypereosinophilic syndrome
- eosinophilic pneumonia
- eosinophilic gastroenteritis
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Endomyocardial fibrosis secondary to the toxic effects of eosinophilic granules on the heart
Loffler's endocarditis
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Congenital abscence of B cells
commonly X linked
very low IgA, IgM and IgG
absent vaccine responses
pyogenic bacterial and enteroviral infections after six months of age
Bruton's agammaglobulinemia
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acquired disorder of antibody production
unkonwn mechanism
Low IgA, IgG or IgM
absent vaccine responses
B cells are present
presents after age 2 with severe infections
associated with autoimmune disease and lymphoma
Common variable immunodeficiency CVID
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Most commonly inherited immunodeficiency
unknown mechanisms
may have relatives with CVID
Isolated low IgA
Minor infections or asymptomatic
associated with celiac disease
IgA deficiency
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Slow to develop normal levels of antibodies
Low IgA, IgG, or IgM
present vaccine responses
minor infections or asymptomatic
resolves by four years of age
Transient hypogammablobulinemia of infancy
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presents in infancy, FTT
both cellular and humoral deficiency
low antibody levels
abscent vaccine responses
opportunistic infections
require bone marrow transplant
IVIG until transplant
Severe Combined Immunodeficiency
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thymic hypoplasia
association with conotruncal anomalies
dysmorphic face, cleft palate and hypoparathyroidism
22q deletions
DiGeorge syndrome
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X-linked
eczema
thrombocytopenia
severe infections
Wiskott-Aldrich syndrome
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DNA breakage repair deficiency
affects T and B cell gene rearrangement
ataxia, telangiectasias, leukemia, lymphona, immunodeficiency
Ataxia-telangiectasia
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neutrophils lack NADPH oxidase
NBT or DHR fluorescence test
NOBA neutrophil oxidative burst activation test
skin and organ abscesses
Chronic granulomatous disease
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neutrophils cannot migrate out of vessels
high neutrophil count
abscesses without pus
Leukocyte adhesion deficiency
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abnormal phagosome trafficking
giant granules in PMNs
partial albinism
Chediak-Higashi syndrome
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mutations to elastase gene ELA2
neutropenia in cycles of 3 weeks
stomatitis, OM, abscesses
Cyclic neutropenia
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ELA2 and HAX1 mutations
low absolute neutrophil count
stomatitis, OM, abscesses, pneumonias
Kostmann's syndrome (congenital neutropenia)
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SBDS gene mutations
ineffective hematopoiesis
neutropenia
fat malabsorption due to pancreatic insufficiency
respiratory infections, diarrhea, FTT, metaphyseal dysplasia
Shwachman-Diamond syndrome
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a failure of lymphocyte apoptosis
lymphadenopathy
splenomegaly
anemia
thrombocytopenia
Autoimmune lymphoproliferative syndrome ALPS
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staphylococcal microabscesses
pneumonia with pneumatoceles
coarse facies
dermatitis
markedly increased IgE
Hyper-IgE syndrome (Job syndrome)
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dry eyes, dry mouth, recurrent parotitis
positive ANA, anti Ro, anti La, RF and IgG
increased risk of JIA, SLE, scleroderma, thyroid, PN, lymphoma
Sjogrens syndrome
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regular fevers, abdominal pain
occaisional pericarditis, pleuritis and arthitis
long-standing inflammation leads to amyloidosis
treat with prophylactic colchicine
Familial Mediterranean Fever
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fevers every 4-8 weeks lasting 4-6 days
aphthous ulcers
lymphadenopathy
pharyngitis
tonsillitis
- PFAPA
- Periodic Fever with Aphthous Stomatitis, PHaryngitis, and Adenitis
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oral ulcers
genital ulcers
eye disease
Pathergy test-pustules form at needlestick sites
Behcet's Disease
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