Allergy & Immunology
Expert discussions on allergic conditions, immunodeficiencies, drug hypersensitivity, and immunotherapy approaches.
Recent Discussions
How do you approach work up for underlying rheumatologic disease in patients referred for chronic urticaria?
Chronic urticaria (6 weeks or longer) is often a self-limited disorder seemingly idiopathic in etiology. There are certain autoimmune disease more prevalent in patients with chronic urticaria including systemic lupus erythematosus, Sjogren's syndrome, autoimmune thyroid disease, celiac sprue, and rh...
Do you favor skin testing over direct oral challenge when the penicillin reaction history is remote but poorly characterized in a hospitalized adult?
Both the fact that the reaction was remote and poorly characterized support direct amoxicillin challenge (rather than skin testing). According to the 2022 Drug Allergy Practice Parameter Update, direct oral amoxicillin challenge may be considered in adults with distant mild reactions, and since that...
What is the rationale/evidence to support doing 4 puffs of albuterol vs. 2 puffs for a reversibility study?
The rationale per ATS in 2005 is that 4 puffs of albuterol is higher on the dose-response curve and thus would potentially avoid getting a suboptimal (< 12%, < 200 mL) response from 2 puffs. Having said that, there was a study of this issue in 240 pediatric patients showing non-inferiority of 2 puff...
How do you approach treating patients who develop psoriasis while on Dupixent?
Stop the Dupixent. These patients likely had a non-Th2 driven type of dermatitis e.g. Malassezia yeast hypersensitivity, which is Th17 driven, or stasis dermatitis with autoeczematization, or eczematous drug reaction. Revisit the Diagnostic Checklist for Generalized Dermatitis.
What therapies would be considered safe and effective in pregnant patients with EoE?
Management of EoE during pregnancy should be individualized using a shared decision-making model. Food elimination can lead to remission, but some patients have difficulty following the diet. Proton pump inhibitors, such as omeprazole and esomeprazole, and swallowed budesonide are safe during pregna...
How often, if at all, do you monitor a CBC with differential to assess peripheral eosinophilia in patients with type 2 inflammatory asthma who have been started on dupilumab?
For most patients, a baseline CBC with differential followed by a recheck at approximately 3 months aligns with the observed pharmacokinetics of eosinophil rebound. GINA 2026 notes transient blood eosinophilia occurs in 4–13% of patients, with rare EGPA cases potentially unmasked following OCS reduc...
In a female patient in her 50s with ovarian cancer who developed a whole-body rash and lip swelling 7 days after her first cycle of carboplatin, paclitaxel, and bevacizumab, how would you proceed with pretreatment for cycle 2, assuming this was a delayed reaction to carboplatin or paclitaxel?
It is very important to characterize any delayed rash after treatment with its timing, morphology, severity, and whether features of a severe cutaneous adverse reaction are present. A benign delayed rash is the most common scenario and can generally be treated with symptomatic management and enhance...
When do you consider de-escalating therapy such as dupilumab in eosinophilic esophagitis?
It is first important to recognize that EoE is a chronic condition. In a patient whose EoE is successfully being treated (whether it be with PPI therapy, swallowed steroids, food elimination, or dupilumab), the disease will invariably become active again over time if therapy is stopped. This is why ...
Do you test adults for food allergies if they have non-IgE mediated symptoms to provide them reassurance?
I would like to say that I never get IgE food testing if the clinical history does not justify it. That's the easy answer, as it is almost always the correct one. And yet, I'm guessing we have all had patients who have debilitating anxiety, and have already undergone prolonged, extensive elimination...
Where can testing for anti-IgA IgG be obtained?
I am only aware of the Red Cross measuring IgG anti-IgA antibodies. It would be helpful to know why you are wanting to get this test since it may or may not be useful.