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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Molecular detection of Babesia bovis and Babesia bigemina in white-tailed deer (Odocoileus virginianus) from Tom Green County in central Texas.
Veterinary Parasitology 2011 May 12
Serologic and molecular evidence suggest that white-tailed deer in South Texas and North Mexico carry the agents of bovine babesiosis, Babesia bovis and Babesia bigemina. To determine if white-tailed deer in central Texas, which is outside the known occurrence of the vector tick at this time, harbor these parasites, blood samples from free-ranging and captive white-tailed deer (Odocoileus virginianus) in Tom Green County were tested by polymerase chain reaction (PCR) assays for B. bovis and B. bigemina 18S rDNA. Of the 25 samples tested, three (12%) were positive by nested PCR for B. bovis. This identity was confirmed by sequence analysis of the cloned 18S rDNA PCR product. Further confirmation was made by sequence analysis of the rRNA internal transcribed spacer (ITS) 1, 5.8S rRNA gene, and ITS 2 genomic region in two (representing samples from two different ranches) of the B. bovis positive samples. Three samples were positive by B. bigemina nested PCR, but sequencing of the cloned products confirmed only one animal positive for B. bigemina; Theileria spp. DNA was amplified from the other two animal samples. In addition to Theileria spp., two genotypically unique Babesia species sequences were identified among the cloned sequences produced by the B. bigemina primers in one sample. Phylogenetic analysis showed no separation of the deer B. bovis or B. bigemina 18S rDNA, or deer B. bovis ITS region sequences from those of bovine origin. Clarification of the possible role of white-tailed deer as reservoir hosts in maintaining these important pathogens of cattle is critical to understanding whether or not deer contribute to the epidemiology of bovine babesiosis.
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