Purulent meningitis and viral encephalitis are the most common neuroinfections in children. The severity of the lesion, the frequency of disabling manifestations, as well as high mortality, determine the relevance of their study. Violations of hemostasis both in purulent meningitis and in viral encephalitis are some of the important pathogenetic mechanisms that determine the nature of the course and the similarity of the disease. The material for clinical, laboratory, and radiation studies was

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... 00 children with purulent meningitis of various etiologies and viral encephalitis from the age of 1 month to 17 years 11 months. In addition to clinical monitoring, all patients underwent D-dimer and circulating endotheliocytes in the acute period and disease dynamics. The different nature of vascular damage has been proved: with the prevalence of endothelial damage in purulent meningitis, and a violation of its functional activity with vascular tone dysfunction — in case of viral encephalitis. Radiation markers of cerebral vascular damage in the acute period of neuroinfections are described. The pathogenetic significance of structural and functional disorders of the vascular wall and hemostasis in the genesis of purulent meningitis and viral encephalitis in children has been established.