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Type 3 poliovirus/Finland/1984 is genetically related to common Mediterranean strains

¹ Enterovirus Laboratory, Department of Virology and Molecular Biology Unit, National Public Health Institute, Mannerheimintie 166, SF-00300 Helsinki, Finland
² Rijksinstituut voor Volksgezondheid en Milieuhygiene, Bilthoven, The Netherlands
and³ Division of Viral Diseases, Centers for Disease Control, Atlanta, Georgia 30333, U.S.A.

Strains of poliovirus type 3 isolated in Finland in 1984 and 1985 (P3/Fin/84) are known to differ considerably from the type 3 vaccine strains in both nucleotide sequence and antigenic properties. In the search for the origin of the outbreak we first tested 80 type 3 strains that had been isolated elsewhere in the world during the years 1953 to 1986. An oligonucleotide probe complementary to a highly variable 17 nucleotide interval in the 5' non-coding region of the genomic RNA of P3/Fin/84 reacted with five strains. Also it was revealed that two of the latter five strains were related to the P3/Fin/84 strains in two separate genomic regions compared after partial RNA sequencing. One of them was isolated in Switzerland in 1980 and the other in Turkey in 1981. The Swiss strain was from a patient who had recently returned from a journey to various Mediterranean countries. Consequently, 16 other strains isolated in the late 1970s and early 1980s in Europe or in the Mediterranean countries were studied in detail by partial genomic sequencing and with neutralizing monoclonal antibodies. Two separate regions of the genome were compared by sequencing and corresponding dendrograms were constructed. The Switzerland and Turkey strains were found to be the strains most closely related to the viruses of the 1984 Finland epidemic. These results indicate that type 3 poliovirus strains related to P3/Fin/84 had been circulating in Mediterranean countries since the late 1970s.

Received 20 February 1990; accepted 3 July 1990.

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