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Journal of Clinical Microbiology, July 1998, p. 1912-1918, Vol. 36, No. 7
Laboratory of Virology, Istituto Superiore di
Sanità, Rome, Italy1;
Laboratory
of Virology, Public Health Institute, Tirana,
Albania2;
Diagnostic Laboratory for
Infectious Diseases and Perinatal Screening, National Institute of
Public Health and the Environment, Bilthoven, The
Netherlands3;
Department of
Virology, National Public Health Institute, Helsinki,
Finland4; and
Unité de
Virologie Médicale, Institut Pasteur, Paris,
France5
Received 4 December 1997/Returned for modification 9 February
1998/Accepted 30 March 1998
Mass vaccination has led poliomyelitis to become a rare disease in
a large part of the world, including Western Europe. However, in the
past 20 years wild polioviruses imported from countries where polio is
endemic have been responsible for outbreaks in otherwise polio-free
European countries. We report on the characterization of poliovirus
isolates from a large outbreak of poliomyelitis that occurred in
Albania in 1996 and that also spread to the neighboring countries of
Yugoslavia and Greece. The epidemics involved 145 subjects, mostly
young adults, and caused persisting paralysis in 87 individuals and 16 deaths. The agent responsible for the outbreak was isolated from 74 patients and was identified as wild type 1 poliovirus by both
immunological and molecular methods. Sequence analysis of the genome
demonstrated the involvement of a single virus strain throughout the
epidemics, and genotyping analysis showed 95% homology of the strain
with a wild type 1 poliovirus strain isolated in Pakistan in 1995. Neutralization assays with both human sera and monoclonal antibodies
were performed to analyze the antigenic structure of the epidemic
strain, suggesting its peculiar antigenic characteristics. The
presented data underline the current risks of outbreaks due to imported
wild poliovirus and emphasize the need to improve vaccination efforts
and also the need to implement surveillance in countries free of
indigenous wild poliovirus.
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Antigenic and Molecular Characterization of Wild Type 1 Poliovirus Causing Outbreaks of Poliomyelitis in Albania and
Neighboring Countries in 1996
*
Corresponding author. Mailing address: Laboratory of
Virology, Istituto Superiore di Sanità, V. le Regina Elena
299, 00161 Rome, Italy. Phone: 39(6)49903256. Fax: 39(6)49902082.
E-mail: fiore{at}virus1.net.iss.it.
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