Background: The purpose of this study was to analyze the epidemiological differences of SAA in children with viral central nervous system (CNS) infection and Kawasaki’s Disease(KD). The former is viral invasion of central nervous system, whereas the latter is a viral systemic vasculitis. Differences in the SAA concentration in the blood and the proportion of high level SAA cases reflected the influence of the blood-cerebrospinal fluid barrier (BCB) on the concentration of peripheral blood infection markers.Methods: The SAA data comprised 226 consecutive cases of children, including 112 cases of viral CNS infection and 114 cases of KD. Differences in the proportion and concentration of SAA in the cases of the two groups were verified with a Kruskal-Wallis H-test and the chi-square test.Results: The concentration of SAA differed between children with KD and viral CNS infection, and the high level SAA proportion was lower in children with viral CNS infection compared to that in the KD group.Conclusions: The observed differences may be due to the sequestration effect, as the blood-cerebrospinal fluid barrier (BCB) can compartmentalize the pathogens at the site of disease. Therefore, other organs are unable to be stimulated to release additional SAA.
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