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Infection and Immunity, July 2000, p. 3873-3877, Vol. 68, No. 7
TVW Telethon Institute for Child Health
Research,1 and Departments of
Microbiology4 and
Paediatrics,3 University of Western
Australia, Perth, Western Australia, Australia, and
SmithKline Beecham Pharmaceuticals, Rixensart,
Belgium2
Received 28 December 1999/Returned for modification 31 January
2000/Accepted 30 March 2000
Immune responses to exogenous antigens in infant experimental
animals display various degrees of Th2 polarization. Preliminary evidence from small human studies suggest a similar age-dependent response pattern to vaccines, but detailed investigations on vaccine immunity during infancy have not yet been undertaken. We report below
the results of a comprehensive prospective study on responses to the
tetanus component of the diphtheria, tetanus, acellular pertussis
(DTaP) vaccine in a cohort of 55 healthy children, employing peripheral
blood mononuclear cells (PBMC) collected at the 2-, 4-, and 6-month
vaccinations and at 12 months. Antigen-specific production of
interleukin-4 (IL-4), IL-5, IL-6, IL-9, IL-10, IL-13, and gamma
interferon (IFN-
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Antigen-Specific Responses to
Diphtheria-Tetanus-Acellular Pertussis Vaccine in Human Infants Are
Initially Th2 Polarized
) was determined at each sample point, in parallel
with polyclonal (phytohemagglutinin PHA-induced) cytokine responses.
Our results indicate early and persistent Th2 responses to the vaccine,
in contrast to a more delayed and transient pattern of IFN-
production. This initial disparity between the Th1 and Th2 components
of the vaccine response was mirrored by patterns of polyclonally
induced cytokine production, suggesting that the delayed maturation of
the Th1 component of the vaccine response during infancy is secondary
to developmental processes occurring within the overall Th cell system.
*
Corresponding author. Mailing address: Division of Cell
Biology, TVW Telethon Institute for Child Health Research, P.O. Box 855, West Perth, WA 6872, Australia. Phone: 61 8 9340 8592. Fax: 61 8 9381 8086. E-mail: patrick{at}ichr.uwa.edu.au.
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