 | RICKETTSIOLOGY: Present and Future Directions
Copyright © 2003 by the New York Academy of Sciences
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Annals of the New York Academy of Sciences 990:25-35 (2003)
© 2003 New York Academy of Sciences
Scrub Typhus
Vector Competence of Leptotrombidium chiangraiensis Chiggers and Transmission Efficacy and Isolation of Orientia tsutsugamushi
K. LERDTHUSNEEa,
B. KHUNTIRATa,
W. LEEPITAKRATa,
P. TANSKULa,
T. MONKANNAa,
N. KHLAIMANEEa,
I. INLAOa,
A. KENGLUECHAa,
S. MUNGVIRIYAa,
K. CHANDRANOIa,
P. KRAIROJANANANa,
D. BODHIDATTAb,
W. RODKWAMTHOOKb,
D. PHULSUKSOMBATIc,
N. SANGJUNc,
P. WATCHARAPICHATb,
J. W. JONESa AND
R. E. COLEMANa
aDepartment of Entomology, bResearch Division, and cAnalysis Division, Royal Thai Army Component, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand
Address for correspondence: Kriangkrai Lerdthusnee, Department of Entomology, USAMC-AFRIMS, 315/6 Rajvithi Rd., Phya Thai, Bangkok 10400, Thailand.
Ann. N.Y. Acad. Sci. 990: 25-35 (2003).
A total of 4,281 rodents, belonging to 20 species, was collected from three villages in Chiangrai Province, northern Thailand, from January 1994 to December 2001. The predominant species were Rattus rattus, R. losea and Bandicota indica, accounting for 96% of the total. More than 135,000 chigger mites were removed from wild rodents of which 1% were identified as Leptotrombidium chiangraiensis, a new species vector of scrub typhus. Five Orientia tsutsugamushi-infected L. chiangraiensis colonies established from chiggers removed from R. rattus and R. losea rodents. The prevalence of O. tsutsugamushi infection in colonies ranged from 7-89%. Vertical and horizontal transmission efficacies of O. tsutsugamushi were stable between generations among colonies of L. chiangraiensis. The two isolates of O. tsutsugamushi obtained from individual adult L. chiangraiensis mites represent the first successful isolation of this bacterium from individual adult mites. Characterization of the O. tsutsugamushi isolates is under way.
Key Words: scrub typhus • vector competence • Leptotrombidium chiangraiensis • transmission efficacy • isolation • Orientia tsutsugamushi
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K. LERDTHUSNEE, S. JENKITKASEMWONG, S. INSUAN, W. LEEPITAKRAT, T. MONKANNA, N. KHLAIMANEE, W. CHAREONSONGSERMKIJ, S. LEEPITAKRAT, K. CHAYAPHUM, and JAMES. W JONES
Comparison of Immune Response against Orientia tsutsugamushi, a Causative Agent of Scrub Typhus, in 4-Week-Old and 10-Week-Old Scrub Typhus-Infected Laboratory Mice Using Enzyme-Linked Immunosorbent Assay Technique
Ann. N.Y. Acad. Sci.,
October 1, 2006;
1078(1):
607 - 612.
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