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Evidence that multiple vaccinations during deployment are to blame is inconclusive
| The first 150 words of the full text of this article appear below. |
Vaccinations could have long term, non-specific
effects on immune responses in children and adults, some undesirable,
others beneficial. For example, there has been speculation that
vaccines could influence the development of atopy. We have known for
years that the pertussis vaccine is an adjuvant for IgE production, and
conjecture that vaccinations might have contributed to the rise in
atopic disease in children was an inevitable corollary of the
"hygiene hypothesis."1 This hypothesis proposes that the prevalence of atopy has increased because infections in early life
protect against atopy and children have been less exposed to infections
over time. The discovery of polarised T helper cell responses, Th1 and
Th2, fuelled the debate.2 It led to a theoretical model
whereby the development of atopy characterised by Th2-type cytokine
responses to allergens and production of IgE might be promoted by
vaccines that induce Th2 cytokines or inhibited by those that induce
Th1