Accession Number : AD1036474


Title :   Detection of Coxiella Burnetii (Q fever) and Borrelia Burgdorferi (Lyme Disease) in Field-Collected Ticks from the Cayo District of Belize, Central America


Descriptive Note : Technical Report


Corporate Author : Uniformed Services University of the Health Sciences Bethesda United States


Personal Author(s) : Cline,Amanda A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1036474.pdf


Report Date : 25 Mar 2016


Pagination or Media Count : 51


Abstract : Background: Little documented tick-borne disease data exists for Central America. Several tick-borne diseases are suspected of occurring in Central America, based on patient symptoms, and a need to test local tick populations for various tick borne diseases and to describe their possible presence and geographical distribution mayassist public health authorities in prevention and control efforts. For this project, real-time quantitative PCR (qPCR) methods are used to screen for Coxiella burnetii (Q fever) andthe bacterial spirochete Borrelia burgdorferi (Lyme disease) in the tick population of the Cayo District of central Belize. Methods: A total of 272 field-collected ticks (97 tick pools) were previously collected in Belize from tick drags and host collection methods for this study. The wet season (November) yielded 180 specimens and the dry season (February) yielded 92 specimens. Ticks were cut in half, DNA extracted and screened for the above-mentioned pathogens using qPCR methods. qPCRs were conducted for each pathogen and repeated reactions for positive confirmation performed on an ABI 7500 FAST real time PCR instrument and program to investigate their prevalence in tick pools from Belize. Fishersexact test was used to determine the association between climatic conditions and presence of B. burgdorferi and C. burnetii. Results: All 97 tick pools collected were tested for the presence of C. burnetii (Q fever) and B. burgdorferi (Lyme disease) using SYBR Green-based qPCR assays as described previously. Of these, 0 (0%) ticks tested positive for the presence of C. burnetii DNA, of which 1 possible positive specimen could be identified. Three (3%) tick pools tested positive for the presence of B. burgdorferi DNA, one positive pool containing five male Amblyomma maculatum ticks and two tick pools containing 20 each of Dermacentor nitens larvae. C. burnetii was not positively identified in this study, but prevalence for B. burgdorferi was analyzed.


Descriptors :   ticks , arachnid bites and stings , q fever , gramnegative bacterial infections , preventive medicine , infectious diseases , rickettsial diseases , bacteria , public health , belize , biomedical research , signs and symptoms


Subject Categories : Medicine and Medical Research


Distribution Statement : APPROVED FOR PUBLIC RELEASE