Abstract
A follow-up study of anti-IgA antibodies in 159 healthy blood donors with severe deficiency of serum IgA (<0.05 mg/L) and in 45 donors with decreased serum IgA levels (0.05–799 mg/L), identified in 1971–1980, was carried out. Initially anti-IgA antibodies were determined by a hemagglutination (HA) method and two reexaminations were done in 1990–1992 by an enzyme immunoassay. The median follow-up period was 19 years, during which anti-IgA level was changed considerably in only four persons, increased in two, and high level antibodies (>1/1000 by HA) appeared in two. In reexaminations anti-IgA antibodies were found in 30 (19%) subjects with severe IgA deficiency and the antibody levels remained relatively constant in those who had high and medium antibody levels. Anti-IgA antibodies were not found in subjects with decreased, but detectable serum IgA. Thus it seems that only those healthy adults who have severe IgA deficiency develop anti-IgA antibodies and their anti-IgA levels remain fairly constant Of the 159 subjects with severe IgA deficiency, 66 had a history of IgA exposure, but no correlation to anti-IgA development was noted.
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Portions of the work have been presented in a poster form at the XXIIIrd Congress of the International Society of Blood Transfusion in Amsterdam, the Netherlands, July 2–9, 1994.
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Koskinen, S., Tölö, H., Hirvonen, M. et al. Long-term follow-up of anti-IgA antibodies in healthy iga-deficient adults. J Clin Immunol 15, 194–198 (1995). https://doi.org/10.1007/BF01541089
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DOI: https://doi.org/10.1007/BF01541089