Ticks of domestic animals in Lesotho: Morphological and molecular characterization.

The research paper is about a study carried out to identify and describe the types of ticks present on domestic animals in Lesotho, using both morphological and molecular methods.

Study Sample and Methods

• This study was based on the collection of 3311 tick specimens from various domestic animals like cattle, sheep, goats, horses, donkeys, and dogs.
• These samples were collected from different districts of Lesotho: Berea, Butha-Buthe, Leribe, Mafeteng, Maseru, Mohale’s Hoek, Mokhotlong, Qacha’s Nek, Quthing and Thaba Tseka.
• The researchers identified the tick species firstly through their morphological characteristics and then confirmed their identities by amplifying and sequencing specific parts of the tick DNA – the CO1 and 18S rRNA genes.

Findings

• Nine different species of ticks were identified in the study. The species were: Haemaphysalis elliptica, Hyalomma rufipes, Hy. truncatum, Otobius megnini, Rhipicephalus appendiculatus, Rhipicephalus decoloratus, Rhipicephalus evertsi evertsi, Rhipicephalus glabroscutatum, and Rhipicephalus microplus.
• The numbers and proportions of each species were also noted, with Rhipicephalus evertsi evertsi making up the largest proportion at 65.1%.
• The researchers found significant differences in the distribution and abundance of tick species across different populations.

Molecular Analysis and Genetic Support

• The molecular analysis of the CO1 and 18S rRNA sequences matched the species identified through morphological assessments, thus serving as a confirmation for the morphological identification.
• These sequences also provided strong support for the tick groupings (monophyly) of the Rhipicephalinae and Ornithodorinae complexes – i.e., these are valid taxonomic groupings of tick species, as all members are descended from a common ancestor.
• Hence, they concluded that both these genes (CO1 and 18S rRNA) can serve as useful genetic markers for identifying and categorizing tick species not just in Lesotho but elsewhere too.

Significance of the Study

• This is reportedly the first scientific publication of tick species occurring in Lesotho.
• Such a study could have implications for veterinary practices and animal health management, as well as contribute to the global understanding of tick species distribution and genetic diversity.