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Volume 10, Number 9—September 2004

Research

Experimental Infection of Ground Squirrels (Spermophilus tridecemlineatus) with Monkeypox Virus

Robert B. Tesh*Comments to Author , Douglas M. Watts*, Elena Sbrana*, Marina Siirin*, Vsevolod L. Popov*, and Shu-Yuan Xiao*
Author affiliations: *University of Texas Medical Branch, Galveston, Texas, USA

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Table 1

Results of virus titrations performed on blood (B) and throat swab (TS) samples from monkeypox virus–infected ground squirrelsa

Animal no.b Sample Day after infection
1 2 3 4 5 6 7 8 9
11 B 0.7c 0 1.4 2.9 4.0 D
TS NT 0 0 3.1 5.3
12 B 0 0 1.0 2.9 3.8 4.8 D
TS NT 0 0 2.2 3.9 5.8
13 B 0 0 1.2 3.2 4.2 D
TS NT 0 0 3.9 5.8
14 B 0 0 0.7 2.5 3.9 D
TS NT 0 0 2.9 5.2
15 B 0 0 0.7 3.0 3.9 D
TS NT 0 0 2.5 6.0
16 B 0 0 0 0 1.6 2.1 4.2 D
TS NT 0 0 1.7 3.7 4.6 5.3
17 B 0 0 0 0.7 2.1 2.7 5.0 NT D
TS NT 0 1.7 2.2 4.0 4.9 5.7 6.2
18 B 0 0 0 0 2.0 2.5 4.3 D
TS NT 0 1.0 1.9 2.9 3.5 4.6
19 B 0 0 0 0 0 1.9 4.7 4.2 D
TS NT 1.8 2.3 3.0 3.9 4.0 5.4 4.9
20 B 0 0 0 0 1.0 2.5 5.1 4.8 D
TS NT 2.5 1.7 2.5 3.7 3.9 3.7 5.4

aNT, not tested; D, animal dead.
bAnimals 11–15 were infected intraperitoneally; animals 16–20 were infected intranasally.
cVirus titer expressed as log10 PFU/mL of sample. Values <100.7 were beyond the sensitivity of the assay and were marked as zero.

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