GENOTYPING OF WEST NILE FEVER VIRUS STRAINS CIRCULATING IN SOUTHERN RUSSIA AS AN EPIDEMIOLOGICAL INVESTIGATION METHOD: PRINCIPLES AND RESULTS


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Abstract

Aim. Characteristic of West Nile fever (WNF) virus strains circulating in southern Russia. Materials and methods. WNF RNA was amplified directly from clinical samples, mosquitoes and bird tissues by PCR, nucleotides were sequenced directly and analyzed comparatively. Results. Related but different genovariants of WNF lineage 1a — «Volgograd» and «Astrakhan» — circulated during WNF outbreaks of 1999 and 2000-2003 in Volgograd and Astrakhan regions. In 2005 «Volgograd» WNF variant emerged in Astrakhan region and along with «Astrakhan» variant caused a new morbidity increase. In 2004 in sera of 2 WNF patients from Rostov region WNF lineage 2 RNA was detected, this was the first WNF clinical case caused by WNF lineage 2 outside of Africa. WNF outbreak in Volgograd region in 2007 was caused by this unique WNF lineage that may preliminary be called russian. Finally, during a major WNF outbreak in 2010 in Volgograd and Rostov regions in clinical samples only russian genovariant WNF lineage 2 RNA was detected again. Conclusion. After emergence of a certain WNF genovariant the virus is capable of persisting in natural foci in southern Russia. A near disappearance of one of the WNF clones by substitution or displacement with another may be possible. Determination of genetic characteristics of WNF strains circulating in Russia is an important element of WNF epidemiological surveillance and control of this disease.

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ГЕНОТИПИРОВАНИЕ ШТАММОВ ВИРУСА ЛИХОРАДКИ ЗАПАДНОГО НИЛА, ЦИРКУЛИРУЮЩИХ НА ЮГЕ РОССИИ, КАК МЕТОД ЭПИДЕМИОЛОГИЧЕСКОГО РАССЛЕДОВАНИЯ: ПРИНЦИПЫ И РЕЗУЛЬТАТЫ
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About the authors

A. E Platonov

Central Research Institute of Epidemiology, Moscow, Russia

L. S Karan

Central Research Institute of Epidemiology, Moscow, Russia

T. A Shopenskaya

Central Research Institute of Epidemiology, Moscow, Russia

M. V Fedorova

Central Research Institute of Epidemiology, Moscow, Russia

N. M Kolyasnikova

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

N. M Rusakova

Center of Hygiene and Epidemiology in Volgograd region, Russia

L. V Shishkina

Center of Hygiene and Epidemiology in Volgograd region, Russia

T. E Arshba

Regional Clinical Infectious Diseases Hospital, Astrakhan, Russia

V. I Zhuravlev

Central Research Institute of Epidemiology, Moscow; Astrakhan Station for Plague Control, Russia

M. V Govorukhina

Center of Hygiene and Epidemiology in Rostov region, Russia

A. A Valentseva

City Hosptial No. 1, Rostov-on-Don, Russia

G. A Shipulin

Central Research Institute of Epidemiology, Moscow

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Copyright (c) 2011 Platonov A.E., Karan L.S., Shopenskaya T.A., Fedorova M.V., Kolyasnikova N.M., Rusakova N.M., Shishkina L.V., Arshba T.E., Zhuravlev V.I., Govorukhina M.V., Valentseva A.A., Shipulin G.A.

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