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Journal of Virology, January 2000, p. 987-991, Vol. 74, No. 2
0022-538X/00/$04.00+0
Genetic Determinants of Altered Virulence of
Taiwanese Foot-and-Mouth Disease Virus
Clayton W.
Beard
and
Peter W.
Mason*
Plum Island Animal Disease Center,
Agricultural Research Service, U.S. Department of Agriculture,
Greenport, New York
Received 17 June 1999/Accepted 6 October 1999
In 1997, a devastating outbreak of foot-and-mouth disease (FMD) in
Taiwan was caused by a serotype O virus (referred to here as OTai) with
atypical virulence. It produced high morbidity and mortality in swine
but did not affect cattle. We have defined the genetic basis of the
species specificity of OTai by evaluating the properties of genetically
engineered chimeric viruses created from OTai and a bovine-virulent FMD
virus. These studies have shown that an altered nonstructural protein,
3A, is a primary determinant of restricted growth on bovine cells in
vitro and significantly contributes to bovine attenuation of OTai in vivo.
*
Corresponding author. Mailing address: Plum Island
Animal Disease Center, USDA, ARS, P.O. Box 848, Greenport, NY 11944. Phone: (631) 323-3177. Fax: (631) 323-2507. E-mail:
petermas{at}asrr.arsusda.gov.

Present address: Maxygen Inc., Redwood, CA
94063.
Journal of Virology, January 2000, p. 987-991, Vol. 74, No. 2
0022-538X/00/$04.00+0
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