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[Arboviruses and arbovirus infections in the forest steppe zone of Ukraine].

New active natural foci of the tick-borne encephalitis, West Nile, California serologic group (CSG) and Batai viruses have been identified as a result of comprehensive virologic and serologic investigations in the forest-steppe zone of Ukraine. These observations were confirmed by the results of these pathogens study and identification of the corresponding antigens in natural biological substrates and in the blood of ill people. Several human pathogenetic viruses, including Inko, Snow hoc hare with CSG and Crimean hemorrhagic fever were found for the first time in the forest-steppe zone. Viruses populations circulating there are heterogeneous according to their genetic properties. New data concerning their ecology were obtained. A close etiological relation between the acute seasonal febrile diseases and the above mentioned arboviruses was found. Arboviral infections from 23.6% of the total amount of spring-summer-autumn febrile diseases. The West Nile fever (53.1%) is the leading arboviral infection in the forest-steppe zone. A quarter of all arboviral infections is represented by tick-borne encephalitis. Diagnostic preparations have been made and the available methods of laboratory diagnostics of the arboviral infections have been improved.

Animals↗
PubMed1984

[Serologic survey on arbovirus infections in patients presenting with uveitis].

Viruses have been demonstrated or suspected as the causative agents of various types of uveitis. Some arboviruses can be responsible for ocular manifestations. In Brittany, both serosurveys and virus isolations were positive for arboviruses. These results led us to look for the possible role of arboviruses in the aetiology of uveitis. For this, we performed a serosurvey on 131 patients with uveitis of unknown aetiology. Patients were examined in the Ophthalmologic Department of the Brest University Hospital from May 1979 to May 1983. Serum samples were studied: by haemagglutination inhibition (HI) tests against thirteen antigens; by complement fixation (CF) tests against six antigens. The HI and CF tests were performed using micromethods. HI tests revealed antibodies against one or more flaviviruses antigens in thirteen patients: nine monospecific reactions against Yellow Fever virus (as a consequence of a vaccination) and four reactions against several flaviviruses. The four positive reactions are easily explainable by previous trips in countries where several arboviruses are endemic. By CF test we found antibodies at a low titer in two patients: the first one had antibodies against the Zaliv Terpeniya virus and the second against the Avalon virus. Signification of these results is discussed. Our study shows that in Brittany uveitis of unknown aetiology do not seem to be due to arboviruses, at least those tested in this survey or antigenically related.

Adolescent↗