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A 4.5-year-old boy and a 5-year-old girl are presented because they showed behavioral changes after the flu vaccine. Besides the known side effects of the flu vaccine, encephalopathy is rare and not well-known by pediatricians. This case was presented to increase awareness of this issue and inform family physicians and pediatricians about this subject.
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A. Murat Tuncer (2025) studied this question.
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