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Volume 16, Number 3—March 2010

Research

Borrelia, Ehrlichia, and Rickettsia spp. in Ticks Removed from Persons, Texas, USA

Phillip C. WilliamsonComments to Author , Peggy M. Billingsley, Glenna J. Teltow, Janel P. Seals, Meredith A. Turnbough, and Samuel F. Atkinson
Author affiliations: University of North Texas Health Science Center, Fort Worth, Texas, USA (P.C. Williamson, P.M. Billingsley, J.P. Seals); Texas Department of State Health Services, Temple, Texas, USA (G.J. Teltow); University of North Texas, Denton, Texas, USA (M.A. Turnbough, S.F. Atkinson)

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Table 2

Number and identity of ticks submitted to University of North Texas Health Science Center by the Texas Department of State Health Services Zoonosis Control Program, October 1, 2004, to September 30, 2008*

Tick No. positive/no. tested
Borrelia spp.
Ehrlichia spp.
Rickettsia spp.
Total
UNE PE E UNE PE E UNE PE E
Amblyomma americanum
Adult male 0/0 1/116 0/1 0/0 0/116 0/1 0/0 25/116 0/1 26/117
Adult female 0/0 1/109 0/11 0/0 2/109 0/11 0/0 23/109 4/11 30/120
Nymph 0/0 1/92 1/27 0/0 0/92 0/27 0/0 18/92 9/27 29/119
Larva
0/0
0/11
0/0

0/0
0/11
0/0

0/0
0/11
0/0

0/11
A. cajennense
Adult male 0/0 0/44 0/2 0/0 1/44 0/2 0/0 0/44 0/2 1/46
Adult female 0/0 1/56 0/3 0/0 0/56 0/3 0/0 0/56 0/3 1/59
Nymph 0/0 0/52 0/3 0/0 0/52 0/3 0/0 3/52 1/3 4/55
Larva
0/0
0/12
0/0

0/0
0/12
0/0

0/0
1/12
0/0

1/12
A. maculatum
Adult male 0/0 0/7 0/0 0/0 1/7 0/0 0/0 0/7 0/0 1/7
Adult female 0/0 0/1 0/1 0/0 0/1 0/1 0/0 0/1 0/1 0/2
Nymph 0/0 0/1 0/0 0/0 0/1 0/0 0/0 0/1 0/1 0/1
Larva
0/0
0/1
0/0

0/0
0/1
0/0

0/0
0/0
0/0

0/0
Dermacentor variabilis
Adult male 0/1 0/71 0/1 0/1 0/71 0/1 0/1 4/71 0/0 4/73
Adult female 0/3 1/84 0/16 0/3 0/84 0/16 0/3 6/84 1/16 8/103
Nymph 0/0 0/0 0/2 0/0 0/1 0/2 0/0 0/0 0/2 0/2
Larva
0/0
0/0
0/0

0/0
0/1
0/0

0/0
0/0
0/0

0/0
Ixodes scapularis
Adult male 0/0 0/4 0/0 0/0 0/4 0/0 0/0 0/4 0/0 0/4
Adult female 0/0 0/41 0/22 0/0 0/41 0/22 0/0 26/41 6/22 32/63
Nymph 0/0 1/8 0/1 0/0 0/8 0/1 0/0 4/8 0/1 5/9
Larva
0/0

0/0

0/0
0/0
0/0

0/0
0/0
0/0

0/0
Rhipicephalus sanguineus
Adult male 0/0 0/23 0/0 0/0 0/23 0/0 0/0 0/23 0/0 0/23
Adult female 0/2 0/35 0/6 0/2 0/35 0/6 0/2 1/35 0/6 1/43
Nymph 0/0 0/5 0/15 0/0 0/5 0/15 0/0 0/5 1/15 1/20
Larva
0/0
0/0
0/1

0/0

0/1

0/0

0/1

0/1
Total 0/6 6/772 1/112 0/6 4/772 0/112 0/6 111/772 22/112 144/890

*Testing by PCR. Only tick species that showed evidence of containing Borrelia, Ehrlichia, or Rickettsia spp. are shown. Seven specimens of Otobius megnini, 2 of Amblyomma inornatum and Dermacentor albipictus, and 1 each of Dermacentor andersonii and Dermacentor nigrolineatus ticks were submitted during the project period. After clarification with the submitter of the D. andersonii specimen, it was concluded that the tick attachment may have occurred in Colorado. UNE, unengorged; PE, partially engorged; E, engorged.

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