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  • Title: Validation of a recombinant protein indirect ELISA for the detection of specific antibodies against Theileria uilenbergi and Theileria luwenshuni in small ruminants.
    Author: Liu Z, Li Y, Salih DE, Luo J, Ahmed JS, Seitzer U, Yin H.
    Journal: Vet Parasitol; 2014 Aug 29; 204(3-4):139-45. PubMed ID: 24912957.
    Abstract:
    An enzyme-linked immunosorbent assay (ELISA) based on a recombinant Theileria uilenbergi immunodominant protein (rTuIP) was validated for detection of antibodies in 188 positive and 198 negative reference serum samples, respectively. The cut-off value was determined at 32.7% with 95% and 90% accuracy levels by two-graphic receiver-operating characteristic (TG-ROC). The equal diagnostic sensitivity (Se) and specificity (Sp) were calculated to be 98.4%. Further validation of the repeatability with positive and negative reference samples indicated the reliable performance of the assay. Monitoring the antibody dynamics of sheep experimentally infected with Theileria luwenshuni showed the efficient detection of antibody response against the pathogen at the early infection stage and up until two months post infection. Application of this assay for detection of antibody in field sera from previous unknown Theileria endemic regions in Suizhou and Guiyang showed 17.8% and 11.6% seroprevalence, respectively, and presence of the pathogen was confirmed by identification of the 18S rRNA gene in the corresponding blood of the seropositive animals. These data support that the rTuIP ELISA could be a useful tool to study the epidemiology of theileriosis caused by T. uilenbergi and/or T. luwenshuni.
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