PERSISTENCE OF ANTIBODIES SPECIFIC TO WEST NILE VIRUS IN BLOOD OF RECONVALESCENTS OF VOLGOGRAD REGION


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Abstract

Aim. Determine the duration of persistence of IgM and IgG in reconvalescents of West Nile fever (WNF) 1 year after the disease in southern regions of Russia and evaluate effectiveness of PCR method for acute infection diagnostics. Materials and methods. Blood sera of 87 patients with WNF diagnosis was studied for the presence of West Nile virus (WNV) RNA and IgM and IgG by PCR and EIA. Samples of the first sera were collected in 2010 at days 2 - 30 after the onset of the disease, samples of the second sera - at days 5 - 23 and third - 264 - 385 days later. Results. During the first 2 weeks of the disease WNV RNA was detected in more than 50% of patients. In all the first sera IgM at titers of >1:800 were detected. Seroconversion of IgG titers of 4 and more times was observed in 83% (30/36) of patients. In 2011 IgG were detected in 91% of reconvalescents (79/87), IgM - in 57% (50/87), and in 25% (22/87) IgM titers were >1:800. Conclusion. The results obtained give evidence on the necessity of using several diagnostic criteria simultaneously for the confirmation of WNF clinical diagnosis.

Keywords

IgM, IgG

About the authors

L. S Karan

Central Research Institute of Epidemiology, Moscow, Russia

M. V Fedorova

Central Research Institute of Epidemiology, Moscow, Russia

K. A Gridneva

Central Research Institute of Epidemiology, Moscow, Russia

G. A Zabolotnaya

Administration for Maintenance of Performance of Public Health Agencies of Volgograd Region, Volgograd, Russia

V. P Smelyansky

Volgograd Research Institute of Plague Control, Russia

G. A Tkachenko

Volgograd Research Institute of Plague Control, Russia

G. V Malenko

Chumakov Research Institute of Poliomyelitis and Viral Encephalitis, Moscow, Russia

N. M Kolyasnikova

Central Research Institute of Epidemiology; Chumakov Research Institute of Poliomyelitis and Viral Encephalitis, Moscow, Russia

N. V Rusakova

Centre of Hygiene and Epidemiology in Volgograd Region, Volgograd, Russia

L. V Shishkina

Centre of Hygiene and Epidemiology in Volgograd Region, Volgograd, Russia

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Copyright (c) 2014 Karan L.S., Fedorova M.V., Gridneva K.A., Zabolotnaya G.A., Smelyansky V.P., Tkachenko G.A., Malenko G.V., Kolyasnikova N.M., Rusakova N.V., Shishkina L.V.

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