The history of the idea of allergy.

About 100 years ago, a young paediatrician understood that the function of the immune system should be rationalized not in terms of exemption of disease but in terms of change of reactivity. He coined a new word to represent such an idea: 'allergy': the first contact of the immune system with an antigen changes the reactivity of the individual; on the second and subsequent contacts, this change (or allergy) can induce a spectrum of responses from protective (literally, immune) to hypersensitivity ones. The idea was at first hardly understood by the scientific community because it undermined the essentially protective nature of the immune response as it was defined. Nevertheless, in the next years, the growing clinical evidence led to the acceptance of this new point of view, but not of the new word, at least not unconditionally. The original significance of the neologism 'allergy' became perverted and limited to describe hypersensitivity conditions. Perhaps because of the corruption of the term, today 'allergy' does not have a well-delimited significance among health professionals. Furthermore, the word has long ago escaped from physicians and gone to the streets, where it is popularly used also as synonymous with antipathy and rejection. This vulgarization of the term 'allergy' has significantly increased its imprecision.

Spanish multidisciplinary consensus on the characteristics of severe asthma patients on biologic treatment who are candidates for at-home administration.

BACKGROUND AND OBJECTIVE: Biologic therapies are known to reduce exacerbations and improve severe uncontrolled asthma management. The at-home administration of biologics has increased during the COVID-19 pandemic, but the characteristics of severe uncontrolled asthma patients who may benefit from at-home administration of biologic therapy have yet to be identified. MATERIALS AND METHODS: This project is based on the Delphi method, designed to reach an expert consensus through a multidisciplinary scientific committee addressing the following questions: clinical characteristics, treatment adherence, patient or caregiver administration ability, patient self-care, relationship with the healthcare professional, patient preference, and access to the hospital. RESULTS: One hundred and thirty-one healthcare professionals (pulmonologists, allergists, nurses, and hospital pharmacists) completed two Delphi consensus questionnaires. Fourteen items were identified as priority characteristics, the first five being: 1. The patient follows the healthcare team's indications/recommendations to control their disease, 2. The patient is capable of detecting any deterioration in their disease and of identifying exacerbation triggers, 3. The patient receives biologic therapy and has stable disease with no vital risk, 4. The patient takes responsibility for their self-care, 5. The patient has occupational/educational obligations that prevent them from going to the hospital regularly. CONCLUSION: Disease stability and control plus the ability to identify exacerbation triggers are the most important characteristics when opting for at-home administration for a patient with severe uncontrolled asthma on biologic therapy. These recommendations could be applicable in clinical practice.

Latex allergy: Position Paper.

Correct management of latex allergy is essential to ensure adequate care of patients who are allergic to latex, which is ubiquitous in the health care setting. In this Position Paper, the Latex Committee of the Spanish Society of Allergology and Clinical Immunology provides guidelines for the management of latex allergy.

Consenso multidisciplinar español sobre las características de los pacientes con asma grave en tratamiento con biológicos susceptibles de pasar a tratamiento domiciliario / Spanish multidisciplinary consensus on the characteristics of severe asthma patients on biologic treatment who are candidates for at-home administration

Antecedentes y objetivo Es bien sabido que las terapias biológicas reducen las exacerbaciones y mejoran el tratamiento del asma grave no controlada. La administración domiciliaria de biológicos ha aumentado durante la pandemia de COVID-19, pero aún no se han identificado las características de los pacientes con asma grave no controlada que pueden beneficiarse de la administración domiciliaria de terapia biológica. Materiales y métodos Este proyecto se basa en la metodología Delphi, diseñada para alcanzar un consenso entre expertos a través de un comité científico multidisciplinar que aborda las siguientes cuestiones: características clínicas, adherencia al tratamiento, capacidad de administración del paciente o cuidador, autocuidado del paciente, relación con el profesional sanitario, preferencias del paciente y acceso al hospital. Resultados Ciento treinta y un profesionales sanitarios (neumólogos, alergólogos, enfermeros y farmacéuticos hospitalarios) cumplimentaron las dos rondas de consenso del cuestionario Delphi. Se identificaron 14 ítems como características prioritarias, siendo los cinco primeros: 1. El paciente sigue las indicaciones/recomendaciones del equipo sanitario para controlar su enfermedad. 2. El paciente es capaz de detectar cualquier deterioro de su enfermedad y de identificar los factores desencadenantes de las exacerbaciones. 3. El paciente recibe tratamiento biológico y tiene una enfermedad estable sin riesgo vital. 4. El paciente se responsabiliza de su autocuidado y 5. el paciente tiene obligaciones laborales/educativas que le impiden acudir al hospital con regularidad (AU)

Background and objective Biologic therapies are known to reduce exacerbations and improve severe uncontrolled asthma management. The at-home administration of biologics has increased during the COVID-19 pandemic, but the characteristics of severe uncontrolled asthma patients who may benefit from at-home administration of biologic therapy have yet to be identified. Materials and methods This project is based on the Delphi method, designed to reach an expert consensus through a multidisciplinary scientific committee addressing the following questions: clinical characteristics, treatment adherence, patient or caregiver administration ability, patient self-care, relationship with the healthcare professional, patient preference, and access to the hospital. Results One hundred and thirty-one healthcare professionals (pulmonologists, allergists, nurses, and hospital pharmacists) completed two Delphi consensus questionnaires. Fourteen items were identified as priority characteristics, the first five being: 1. The patient follows the healthcare team's indications/recommendations to control their disease, 2. The patient is capable of detecting any deterioration in their disease and of identifying exacerbation triggers, 3. The patient receives biologic therapy and has stable disease with no vital risk, 4. The patient takes responsibility for their self-care, 5. The patient has occupational/educational obligations that prevent them from going to the hospital regularly. Conclusions Disease stability and control plus the ability to identify exacerbation triggers are the most important characteristics when opting for at-home administration for a patient with severe uncontrolled asthma on biologic therapy. These recommendations could be applicable in clinical practice (AU)

Allergy to cefazolin: study of in vivo cross reactivity with other betalactams.

We present two cases of hypersensitivity to cefazolin (one anaphylaxis). The skin prick tests with cefazolin at therapeutic concentration were positive. For the in vitro study we used conjugates of cefazolin with human serum albumin, obtaining a positive result in the histamine release test in both patients. In one case, we demonstrated anticefazolin-specific IgE antibodies by RAST. The controls did not react to any of these tests. Finally, we carried out skin tests and challenge tests with other betalactam antibiotics, including benzylpenicillin, amoxicillin, aztreonam, cefuroxime and cefotaxime, showing in both patients good tolerance to all these drugs.

Susceptibility of a grass-pollen oral immunotherapy extract to the saliva and gastric fluid digestive process.

The oral and sublingual immunotherapy is still a controversial therapeutic procedure. One of the problems is knowing how much allergenic activity could the extracts loss due to the digestive process into the mouth and stomach. Using a grass-pollen oral and sublingual immunotherapy extract, we studied its degradation until reaching the small intestine. For this purpose we employed an in vitro model using the RAST-inhibition assay. We observed a 3.8 fold loss of allergenic activity after a 30 sec-incubation with saliva; a subsequent 5 min-incubation with gastric fluid got a final loss of allergenic activity of 10.3 fold. The incubation times were those expected occurring during the ingestion of the extract. It was surprising that after the enzymatic and acid actions of the gastric fluid, an important degree of allergenic activity still remained in the extract. This issue should be taken into account when considering the dose to be administered in oral and sublingual immunotherapy.

Allergy to amoxicillin in patients who tolerated benzylpenicillin, aztreonam, and ceftazidime.

The usual battery of skin tests employed for determining penicillin allergy may fail to detect allergic reactions to side chain-specific beta-lactam agents. We report the cases of six patients who experienced anaphylactic reactions after treatment and challenge with amoxicillin but who tolerated parenteral challenges with benzylpenicillin, aztreonam, and ceftazidime. Results of skin tests for amoxicillin (10 mg/mL) were positive for four of the six patients.

Immediate allergy to natural latex: clinical and immunological studies.

Since 1979 several reports of contact urticaria due to natural latex have been documented. In recent years cases of anaphylaxis, rhinitis, and asthma due to latex have appeared. Nine patients, studied in our clinic between 1986-1991, suffered immediate allergic reactions caused by rubber products. All showed an immediate skin reaction to latex extract. Rub testing with surgical gloves was positive in eight patients. Immunological techniques (RAST, ELISA, HRT) demonstrated specific IgE against latex. Specific bronchial provocation testing was performed in one patient who presented with asthma when she used latex surgical gloves. Patch testing to common rubber additives were negative in our patients. These results suggest that natural latex antigens present in rubber objects can cause hypersensitivity reactions probably due to IgE-mediated mechanisms.

Adverse cutaneous reactions due to macrolides.

Macrolides, which are widely prescribed and seldom produce hypersensitivity reactions, are considered to be safe drugs. We present five patients with generalized skin reactions due to erythromycin and/or spiramycin, proved by oral challenge tests. One patient showed reactions to both erythromycin and spiramycin. All skin prick and patch tests and histamine release tests with both macrolides were negative.

Occupational asthma in a hairdresser caused by persulphate salts.

Persulphate salts, which are common constituents of hair bleaches, have occasionally been reported to cause occupational asthma in hairdressers. We describe the clinical and immunological studies carried out in a hairdresser who developed cutaneous and respiratory symptoms, about 1 year after being employed in a hairdressing salon. Skin prick tests with 1:5 w/v potassium and sodium persulphate extracts were positive in our patient at 15 min and negative in control subjects. The European standard contactans (ECDRG) and a battery of hairdressing agents were patch tested with positive result to KATHON CG (isothiazolinone). The methacholine-inhalation test showed airway hyperresponsiveness. Bronchial provocation test with a 1:50 w/v potassium persulphate extract elicited a nonimmediate asthmatic reaction, followed by recurrent nocturnal fall in FEV1 lasting up to 3 days after the test. Plethysmography results revealed air trapping caused by a marked increase of airway resistance 3 h after the specific bronchial challenge. Histamine release test was not conclusive, and the determinations of specific IgA, IgM, IgG and IgG subclasses by EIA and IgE by RAST against persulphate salts were negative.

Allergy to plant-derived fresh foods in a birch- and ragweed-free area.

BACKGROUND: Allergy to plant-derived fresh foods has often been reported in geographical areas where birch or ragweed pollens are frequent and has been attributed to cross-reactivity to pollens. OBJECTIVE: The aim of this study has been to evaluate allergy to plant-derived fresh foods among pollen-allergic patients from a birch and ragweed-free area. METHODS: Ninety-five pollen-allergic patients took part in the study. The study consisted of a questionnaire, skin prick tests and challenge tests. Pollen skin tests to five grasses, eight trees and seven weeds were performed in duplicate. Prick tests (prick by prick) and challenge tests were carried out with the fresh foods. RESULTS: Most patients allergic to pollens were sensitized to grass (Lolium and Phleum; 97.9%), followed by tree (Olea; 82.1%) and weed pollens (Plantago; 64.2%). 35 of the 95 pollen-allergic patients had positive skin test responses to some plant-derived fresh foods, the highest percentage corresponding to several fruits in the Rosaceae family (peach and pear, 26.3%), followed by Cucurbitacea fruits (melon, 13.7%). The 21. 05% of the pollen-allergic patients were allergic to some type of plant-derived fresh food. Peach was the plant-derived fresh food which most frequently elicited allergy symptoms (12.6%), followed by melon (7.36%). The cluster of positive responses to Rosaceae fruits was higher for skin testing than for challenge testing. CONCLUSION: Peach was the most important allergy provoking fruit in a birch and ragweed free-area where apples were consumed at a rate of two times more than peaches and the patients allergic to pollen were principally sensitized to grass pollens.

Green bean hypersensitivity: an occupational allergy in a homemaker.

As a member of the legume family, the green bean is frequently associated with food allergy. However, allergic reactions caused by skin contact or by inhalation of vapors from boiling legumes are rare. This article presents a case of occupational asthma in a homemaker; symptoms occurred during preparation and cooking of raw green beans. Skin prick, rub, and bronchial provocation tests were performed on the patient. In vitro tests were done with the serum samples of the patient and 10 control subjects (5 atopic and 5 nonatopic). Test results indicate that the patient has type I hypersensitivity to raw green bean antigen(s). This case is of interest because it demonstrates that a food allergen, when inhaled, can induce respiratory symptoms in sensitized patients and may even be the source of primary sensitization.

Severe anaphylactic reaction to thymostimulin.

Thymostimulin is a partially purified extract of calf thymus, consisting of a group of polypeptides with a total molecular weight of approximately 12,000 D. It is used as an immunologic response modifier in primary and secondary immunodeficiencies. We report a patient who had a severe anaphylactic reaction with the first injection of thymostimulin. Type I hypersensitivity to thymostimulin was suggested by an immediate skin test response, specific IgE determination by indirect ELISA and a positive histamine release test. This patient also reacted to bovine serum albumin (BSA), fetal calf serum (FCS) and cow hair and dander. The controls did not react to any of these tests. Clinicians need to be aware that the use of medical products of xenogeneic origin may lead to severe allergic reactions.

Adverse reaction to pomegranate ingestion.

We present a non-atopic 85-year-old woman, with a late-onset recidivant tongue angio-edema due to pomegranate intake, as proven by a double blind oral challenge test. This is the first case ever reported about adverse reaction to pomegranate. We have been unable to demonstrate an IgE-mediated mechanism (prick test, histamine release test and RAST with pomegranate were all negative). We emphasize the importance of clinical history and oral challenge test in the diagnosis of food allergy.

Serum sickness-like syndrome associated with cefaclor therapy.

We describe 2 cases of paediatric patients who developed the main clinical features of a serum sickness reaction, while on treatment with cefaclor. A decrease in complement values was observed in both cases. Physicians should be aware of the possibility of such drug adverse reaction.

IgG subclass response to Aspergillus fumigatus.

The exact clinical meaning of the IgG subclass antibodies remains obscure. In order to contribute to the study of the IgG subclass response, specific IgGtotal and IgG subclass antibodies to Aspergillus fumigatus (Af) were determined by enzyme-linked immunosorbent assay (ELISA) in three groups of patients: 30 asthmatics due to an IgG-mediated hypersensitivity to Af, 30 atopic and 30 nonatopic controls. The results demonstrated that Af-specific IgGtotal, IgG2 and IgG4 antibodies are increased in Af-sensitive patients, although detectable levels of each specific IgG subclass could be found in all the three groups. No differences between atopic and non-atopic controls could be demonstrated.

Anaphylactic reaction to ranitidine.

Ranitidine is a well-tolerated H2-receptor antagonist with a furan ring as nucleus. Anaphylactic reactions are seldom reported despite the wide use of the drug. We report a patient who presented an anaphylactic reaction with ranitidine (Zantac). The positive skin prick test and oral challenge suggest type I hypersensitivity. Specific IgE determination by RAST technique and histamine release test with ranitidine were negative. The patient did not react to other H2-receptor antagonists or to another furan-derivative (nitrofurantoin).

Bronchial asthma induced by chick pea and lentil.

Allergic reactions to legumes through inhalation have rarely been described. We report the case of a 20-year-old man who experienced asthmatic attacks when exposed to the steam from cooking either chick pea or lentil. Type I hypersensitivity to the antigens in these legumes was demonstrated by means of immediate skin reactivity, histamine release tests, RAST and RAST inhibition. Specific bronchial challenges with the heated (75 degrees for 30 min) extracts of chick pea and lentil elicited isolated immediate responses.

Swiss chard hypersensitivity: clinical and immunologic study.

Allergy to vegetables and fruits seems to be more prevalent in atopics, especially in birch pollen-sensitized individuals. We report a case of a grass pollen-sensitized woman, in whom the inhalation of vapor from boiling Swiss chard precipitated rhinoconjunctivitis and asthma. Type I hypersensitivity to Swiss chard was demonstrated by means of immediate skin test reactivity, specific IgE determination by RAST, basophil degranulation, histamine release test, and an immediate bronchial provocation test response to Swiss chard extract. The controls did not react to any of these tests. RAST inhibition assays suggest the presence of some cross-reactivity among Swiss chard and grass pollen antigens, as well as cross-reactivity between vegetables and weed pollens of the chenopod family.

Asthma and contact urticaria caused by rice in a housewife.

We report the case of an atopic housewife who presented with rhinoconjunctivitis-asthma and contact urticaria from handling rice and other cereals. She tolerated cooke cereals. Both skin prick tests with a rice extract (20% w/v) and a rub test with raw rice gave positive results. Bronchial challenge test with methacholine revealed a PC20 of 0.45 mg/ml. The challenge test with raw rice resulted in immediate and late clinical and spirometric responses; pretreatment with DSCG inhibited both responses. The histamine release test (HRT) with rice was positive, and we detected rice-specific IgE antibodies by REIA in the patient's serum. Skin prick tests, HRT, and RAST with a battery of cereals gave positive results. Finally, the rice REIA was inhibited by rice (75%), rye (63%), corn (64%), and wheat (51%) extracts.