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Volume 22, Number 9—September 2016
Dispatch

Large-Scale Survey for Tickborne Bacteria, Khammouan Province, Laos

Andrew J. TaylorComments to Author , Khamsing Vongphayloth, Malavanh Vongsouvath, Marc Grandadam, Paul T. Brey, Paul N. Newton, Ian W. Sutherland1, and Sabine Dittrich1
Author affiliations: Mahosot Hospital, Vientiane, Laos (A.J. Taylor, M. Vongsouvath, P.N. Newton, S. Dittrich); University of Oxford, Oxford, UK (A.J. Taylor, P.N. Newton, S. Dittrich); Institut Pasteur du Laos, Vientiane (K. Vongphayloth, M. Grandadam, P.T. Brey, I.W. Sutherland); US Naval Medical Research Center–Asia, Sembawang, Singapore (I.W. Sutherland)

Main Article

Table 1

Tick pools tested for bacteria after screening by quantitative PCR, Khammouan Province, Laos*

Bacteria and tick species
 No. positive pools/no. tested (%)
Total
 Larvae
 Nymphs
 Adult males
 Adult females
Rickettsia spp.
All 44/768 (5.7) 6/280 (2.1) 37/465 (8.2) 0/12 (0) 1/11 (9.1)
Amblyomma testudinarium 27/279 (10.0) 0/61 (0) 27/217 (12.9) 0/1 (0) 0/1 (0)
Haemaphysalis G1 5/398 (3.8) 6/194 (3.1) 9/200 (4.5) 0/3 (0) 0/1 (0)
H. hystricis 1/6 (16.7) NS NS 0/3 (0) 1/3 (33.3)
Dermacentor auratus
 1/29 (3.4)
 0/0 (0)
 1/26 (3.8)
 0/2 (0)
 0/1 (0)
Ehrlichia spp.
All 12/768 (1.6) 4/280 (1.4) 6/465 (1.3) 1/12 (8.3) 1/11 (9.1)
A. testudinarium 2/279 (0.7) 0/61 (0) 2/217 (0.9) 0/1 (0) 0/1 (0)
Haemaphysalis G1 8/398 (2.0) 4/194 (2.1) 4/200 (2.0) 0/3 (0) 0/1 (0)
H. aborensis
 2/6 (33.3)
 NS
 NS
 1/3 (33.3)
 1/3 (33.3)
Borrelia spp.
All 12/768 (1.6) 2/280 (0.7) 8/465 (1.7) 2/12 (16.7) NS
A. testudinarium 2/279 (0.7) 1/61 (1.6) 1/217 (0.5) 0/1 (0) 0/1 (0)
Haemaphysalis G1 6/398 (1.5) 1/194 (0.5) 5/200 (2.5) 0/3 (0) 0/1 (0)
Haemaphyalis G1.2 1/13 (7.7) NS 1/13 (7.7) NS NS
H. aborensis 2/6 (33.3) NS NS 2/3 (66.7) 0/3 (0)
D. auratus
 1/29 (3.4)
 0/0 (0)
 1/26 (3.8)
 0/2 (0)
 0/1 (0)
Coxiella spp.
All 5/511 (1.0)† 4/187 (2.1)† 1/310 (0.3) 0/8 (0) 0/6 (0)
Haemaphysalis G1
 5/279 (1.8)†
 4/162 (2.5)†
 1/117 (0.9)
 NS
 NS
Anaplasma spp.
All 2/768 (0.3)† 0/280 (0)† 0/465 (0)† 0/12 (0) 0/11 (0)
A. testudinarium 1/279 (0.4)† 0/61 (0) 1/217 (0.5)† 0/1 (0) 0/1 (0)
Haemaphysalis G1 1/398 (0.3)† 1/194 (0.5)† 0/200 (0) 0/3 (0) 0/1 (0)

*NS, no samples were available for screening.
†Includes samples with cycle quantitation values <40 and 40–45.

Main Article

1These senior authors contributed equally to this article.

Page created: August 23, 2016
Page updated: August 23, 2016
Page reviewed: August 23, 2016
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