Immediate hypersensitivity in adults with IgG deficiency and recurrent respiratory infections.
BACKGROUND
Little is known about the prevalence of atopy in adults with recurrent respiratory infections and IgG deficiency.


OBJECTIVE
To elucidate this aspect, we skin-tested 95 consecutive adults with respiratory infections, subnormal levels of IgG subclasses or common variable immunodeficiency and usually poor response to vaccination. In 50 subjects we also measured total IgE.


RESULTS
We found 67 subjects with IgG subclass deficiency, 21 subjects with mild (partial) and 5 with usual common variable immunodeficiency, and 2 subjects with functional IgG deficiency. Atopy was encountered in 42/95 subjects, 33/44 (75%) with asthma, 7/19 (38%) with isolated rhinosinusitis, 1/27 (4%) with chronic obstructive lung disease, and 1/5 (20%) with both the latter disease and asthma, respectively. Atopy was preferentially clustered in subjects with asthma (P < .05) who were less than 40 years of age (P < .05) and nonsmoking. Atopy was not affected by the type of IgG deficiency, unless it was usual common variable immunodeficiency, in which case the skin tests tended to be negative (4/5). Total IgE was within normal range but less elevated than usually seen in asthma or chronic obstructive lung disease. Total IgE was independent of the type of IgG deficiency, except for usual common variable immunodeficiency in which it remained < 10 IU/mL.


CONCLUSIONS
In adults with symptomatic IgG deficiency, the prevalence of immediate hypersensitivity and its modulation by age and smoking are similar to the referred, non-IgG deficient population; however, total IgE may be lower in the former than in the latter. In common variable immunodeficiency, consistent with the literature data, both the prevalence of atopy and serum total IgE are decreased.
Department of Medicine, University of California at Davis, Sacramento, USA.
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D000328:Adult; D001249:Asthma / Q000276:immunology; D006801:Humans; D006969:Hypersensitivity, Immediate / Q000150:complications* / Q000453:epidemiology; D017099:IgG Deficiency / Q000150:complications*; D007073:Immunoglobulin E / Q000032:analysis / Q000172:deficiency; D008173:Lung Diseases, Obstructive / Q000276:immunology; D015995:Prevalence; D012016:Reference Values; D012141:Respiratory Tract Infections / Q000276:immunology*; D012220:Rhinitis / Q000276:immunology; D012852:Sinusitis / Q000276:immunology; D012882:Skin Tests
D007073:Immunoglobulin E