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Journal of Clinical Microbiology, March 2000, p. 945-952, Vol. 38, No. 3
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Resolution of the Pathways of Poliovirus Type 1 Transmission during an Outbreak
Lester M.
Shulman,1,*
Rachel
Handsher,1
Chen-Fu
Yang,2
Su-Ju
Yang,2
Joseph
Manor,1
Ami
Vonsover,1
Zehava
Grossman,1
Mark
Pallansch,2
Ella
Mendelson,1 and
Olen
M.
Kew2
Central Virology Laboratory, Chaim Sheba
Medical Center, Tel-Hashomer 52621, Israel,1
and Division of Viral and Rickettsial Diseases, National Center
for Infectious Diseases, Centers for Disease Control and
Prevention, Atlanta, Georgia 303332
Received 8 July 1999/Returned for modification 23 November
1999/Accepted 9 December 1999
An outbreak of poliomyelitis with 20 cases occurred in Israel,
Gaza, and the West Bank from October 1987 to October 1988. The wild
type 1 poliovirus associated with the outbreak was most closely related
to viruses found in the Nile Delta. The epidemiologic links among
patients involved in the outbreak and patients with community-acquired
infections during the outbreak were inferred from the evolutionary
relationships among isolates of the outbreak virus. Complete VP1
sequences (906 nucleotides) were determined for 12 clinical and 4 sewage isolates. A total of 58 nucleotide differences were found among
the 16 isolates; 74% of all substitutions were synonymous
third-position transitions. An evolutionary tree, representing both the
pathways of VP1 sequence evolution and the inferred chains of virus
transmission during the outbreak, was constructed under the assumption
that each substitution had occurred only once. The combined
epidemiologic and molecular data suggest that a single founder strain
was introduced into Israel from the vicinity of Gaza in the fall of
1987. Poliovirus circulation was apparently localized to southern
communities during the winter and spread north by the following summer
into the Hadera subdistrict of Israel, where it radiated via multiple
chains of transmission into other communities in northern Israel and
the West Bank. The close sequence matches (>99%) between clinical and
sewage isolates from the same communities confirm the utility of
environmental sampling as a tool for monitoring wild poliovirus circulation.
*
Corresponding author. Mailing address: Central Virology
Laboratory, Chaim Sheba Medical Center, Tel-Hashomer 52621, Israel. Phone: 972-3-530-2341. Fax: 972-3-530-2457. E-mail:
cvlsheba{at}netvision.net.il.

This paper is dedicated to the memory of our friend and colleague,
Ami
Vonsover.
Journal of Clinical Microbiology, March 2000, p. 945-952, Vol. 38, No. 3
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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