Clinical and Diagnostic Laboratory Immunology, May 1999, p. 352-355, Vol. 6, No. 3
1071-412X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Department of Infectious Diseases1 and Department of Pediatrics,2 Leiden University Medical Center, Leiden, The Netherlands
Received 22 July 1998/Returned for modification 28 October 1998/Accepted 19 January 1999
In human immunodeficiency virus (HIV)-infected individuals the
amount of antibodies formed after vaccination with T-cell-dependent recall antigens such as tetanus toxoid is proportional to the peripheral blood CD4+ T-lymphocyte counts. To investigate
whether the immunoglobulin G (IgG) subclass distribution and avidity of
the antibodies produced after vaccination are affected as well, we gave
13 HIV-infected adults with low CD4+ T-lymphocyte counts
(<200 × 106/liter; group I), 11 HIV-infected adults
with intermediate CD4+ T-lymphocyte counts (
200 × 106/liter; group II), and 5 healthy controls booster
immunizations with tetanus toxoid. The prevaccination antibody
concentrations against tetanus toxoid were similar in the HIV-infected
and healthy adults. After vaccination the total IgG and the IgG1
anti-tetanus toxoid antibody concentrations were significantly lower in
group I than in group II and the controls. The avidity of the IgG1
anti-tetanus toxoid antibodies formed by HIV-infected adults was within
the range for healthy controls, irrespective of their CD4+
T-lymphocyte counts.
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