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Journal of Clinical Microbiology, Aug 1995, 2069-2076, Vol 33, No. 8
SL Ropp, Q Jin, JC Knight, RF Massung and JJ Esposito
Rapid identification and differentiation of orthopoxviruses by PCR were
achieved with primers based on genome sequences encoding the hemagglutinin
(HA) protein, an infected-cell membrane antigen that distinguishes
orthopoxviruses from other poxvirus genera. The initial identification step
used a primer pair of consensus sequences for amplifying an HA DNA fragment
from the three known North American orthopoxviruses (raccoonpox, skunkpox,
and volepox viruses), and a second pair for amplifying virtually the entire
HA open reading frame of the Eurasian-African orthopoxviruses (variola,
vaccinia, cowpox, monkeypox, camelpox, ectromelia, and gerbilpox viruses).
RsaI digest electropherograms of the amplified DNAs of the former subgroup
provided species differentiation, and TaqI digests differentiated the
Eurasian- African orthopoxviruses, including vaccinia virus from the
vaccinia virus subspecies buffalopox virus. Endonuclease HhaI digest
patterns distinguished smallpox variola major viruses from alastrim variola
minor viruses. For the Eurasian-African orthopoxviruses, a confirmatory
step that used a set of higher-sequence-homology primers was developed to
provide sensitivity to discern individual virus HA DNAs from cross-
contaminated orthopoxvirus DNA samples; TaqI and HhaI digestions of the
individual amplified HA DNAs confirmed virus identity. Finally, a set of
primers and modified PCR conditions were developed on the basis of base
sequence differences within the HA genes of the 10 species, which enabled
production of a single DNA fragment of a particular size that indicated the
specific species.
Copyright © 1995 by the American Society for Microbiology. All rights reserved.
PCR strategy for identification and differentiation of small pox and other orthopoxviruses
Division of Viral and Rickettsial Disease, Centers for Disease Control and Prevention, Atlanta, Georgia 30333, USA.
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