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A Sabin vaccine-derived field isolate of poliovirus type 1 displaying aberrant phenotypic and genetic features, including a deletion in antigenic site 1
MN Mulders, JH Reimerink, M Stenvik, I Alaeddinoglu, HG van der Avoort, T Hovi and MP Koopmans Enterovirus Laboratory, Department of Virology, National Public Health Institute (KTL), Helsinki, Finland. Mick.Mulders@ktl.fi Poliovirus strains derived from the oral poliovirus vaccine (Sabin) can be dif...
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Published in: | Journal of general virology 1999-04, Vol.80 (4), p.907-916 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
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Online Access: | Get full text |
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Summary: | MN Mulders, JH Reimerink, M Stenvik, I Alaeddinoglu, HG van der Avoort, T Hovi and MP Koopmans
Enterovirus Laboratory, Department of Virology, National Public Health Institute (KTL), Helsinki, Finland. Mick.Mulders@ktl.fi
Poliovirus strains derived from the oral poliovirus vaccine (Sabin) can be
differentiated from wild-type poliovirus by tests based on either
immunological or genetic properties of the strains. The characterization of
a recently identified poliovirus type 1 isolate with exceptional properties
is described. Initial phenotypic analysis of the virus by use of polyclonal
absorbed antisera suggested a wild- type character. However, the different
genomic analyses all confirmed the Sabin-derived character of the virus.
All 17 plaques isolated from the strain shared these properties, thus
excluding the possibility of a mixture of a wild-type and a Sabin-derived
strain. To elucidate the properties of this virus further, the nucleotide
sequences of the P1 region and most of the 5' non-coding region were
established. Although the nucleotide identity with Sabin 1 was more than
99.4%, mutations were observed in regions encoding three major antigenic
sites; the deduced amino acid substitutions confirmed the aberrant results
of micro-neutralization assays with site-specific monoclonal antibodies.
The most striking feature was the existence of a hexanucleotide deletion in
the VP1 gene, which gave rise to a two amino acid deletion in the BC loop.
In spite of these antigenic changes, the strain was readily serotyped as
poliovirus type 1 under standard conditions. Likewise, replication of the
virus under cell culture conditions was not affected by these mutations or
by the deletion. Standard polio vaccination protects against this aberrant
virus, and its epidemiological significance remains open. |
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ISSN: | 0022-1317 1465-2099 |
DOI: | 10.1099/0022-1317-80-4-907 |