...there is a suggestion that maternal infection during pregnancy may be linked with an increased risk of childhood leukaemia development. However, the results of all the studies on childhood exposure to infections (six increased, 12 decreased risks, seven no significant effect) and childhood immunizations (four protective, two increased risk, four non-significant effect) are inconclusive.
Из McNally RJ, Eden TO.
An infectious aetiology for childhood acute leukaemia: a review of the evidence.
Br J Haematol. 2004 Nov;127(3):243-63. Review.
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