Penicillin allergy management strategies relevant for clinical practice - a narrative review.

Penicillin allergy is the most commonly reported drug allergy, with prevalence rates ranging from 6% to 31% across various populations and geographic areas. The penicillin allergy label is linked to higher mortality and morbidity rates, extended hospital stays, increased readmission rates, and a greater reliance on second-line antibiotics. Research indicates that nearly 99% of those labeled as penicillin-allergic can tolerate the drug.

Functional MRGPRX2 expression on peripheral blood-derived human mast cells increases at low seeding density and is suppressed by interleukin-9 and fetal bovine serum.

Primary human mast cells (MC) obtained through culturing of blood-derived MC progenitors are the preferred model for the study of MRGPRX2- IgE-mediated MC activation. In order to assess the impact of culture conditions on functional MRGPRX2 expression, we cultured CD34-enriched PBMC from peripheral whole blood (PB) and buffy coat (BC) samples in MethoCult medium containing stem cell factor (SCF) and interleukin (IL)-3, modified through variations in seeding density and adding or withholding IL-6, IL-9 and fetal bovine serum (FBS). Functional expression of MRGPRX2 was assessed after 4 weeks via flow cytometry.

Dominant negative mutations cause ADA2 deficiency in heterozygous carriers.

Human ADA2 deficiency (DADA2) is an inborn error of immunity with a broad clinical phenotype which encompasses vasculopathy including livedo racemosa and lacunar strokes, as well as hemato-immunological features. Diagnosis is based on the combination of decreased serum ADA2 activity and the identification of biallelic deleterious alleles in the gene. DADA2 carriers harbor a single pathogenic variant in and are mostly considered healthy and asymptomatic.