Prevalence and risk factors of tropical theileriosis, and sequencing of Theileria annulata, the causative pathogen, in Setif region (Algeria) before and after tick season
DOI:
https://doi.org/10.19182/remvt.31201Keywords
cattle, Theileria annulata, PCR, DNA sequence, AlgeriaAbstract
To determine the prevalence of Theileria annulata infection and the influence of some risk factors, a molecular survey was carried out in the Setif region (Algeria). A total of 134 cattle blood samples from 21 farms were collected twice, in April and November 2015, before and after the tick vector season. Theileria annulata molecular prevalence was 25.4% in April and and 50% in November, indicating a significant increase (p < 0.001) in the number of asymptomatic carrier animals. The molecular prevalence was significantly higher than the prevalence in Giemsa-stained blood smears for the two periods. In April, the Fleckvieh breed had the lowest molecular prevalence, but this prevalence increased significantly in November (p < 0.001). The breeding type and sex had no influence on T. annulata prevalence. However, the infection rate increased significantly during the tick infestation period as the walls were not roughcast and had cracks (p < 0.001). The Algerian Tams1 gene sequence was very similar to the already known Mauritanian, Tunisian and Egyptian sequences.
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© O.Ayadi et al., hosted by CIRAD 2017
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