Infestation rates, seasonal distribution, and genetic diversity of ixodid ticks from livestock of various origins in two markets of Yaoundé, Cameroon

Yousseu, Francine Sado; Tchetgna, Huguette Simo; Kamgang, Basile; Djonabaye, Doumani; McCall, Philip; Ndip, Roland N.; Wondji, Charles S.

doi:10.1111/mve.12589

Cited by 7 publications

(4 citation statements)

References 44 publications

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“…This nding was similar to that of Boulkaboul (2003), who reported a prevalence of 30% in the province of Tiaret, north-west Algeria. In addition, a higher tick infestation in the cattle population was observed in the present study compared to previously published reports from Ethiopia and Cameroon (Mequanint, 2019;Sado Yousseu et al, 2022). Their ndings included tick infestation with prevalence rates of 40.89% and 39.18% respectively.…”

Section: Predilection Sitessupporting

confidence: 53%

Morphological identification, seasonal prevalence, and predilection sites of hard tick species infesting cattle in four municipalities of the province of Tiaret, northwest Algeria

Achour,

Kouidri,

Selles

et al. 2024

Preprint

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Hard ticks are blood-sucking obligatory ectoparasites that infest all species of domestic ruminants worldwide. The aim of the present study was to determine the identity, seasonal prevalence, and predilection sites of hard tick species infesting cattle in four municipalities of the province of Tiaret, northwest Algeria, during the period May 2022 to May 2023. Out of the 317 cattle that were examined in total, 111 (35.02%) were found to be infested with hard ticks. The overall mean intensity and mean abundance were assessed at 15.78 ticks/infested cow and 5.53 ticks/cow, respectively. A total of 1752 adult ticks were collected; three genera and nine species were identified. As a result, H. excavatum (43.78%), H. marginatum (20.15%), H. lusitanicum (18.32%), H. scupence (8.73%), R. bursa (7.53%), H. impeltatum (0.74%), R. (Boophilus) annulatus (0.46%), R. sanguineus (0.23%), and D. marginatus (0.06%). For the majority of tick species found, higher numbers of male ticks were collected than female ticks. Seasonally, the summer season (38.01%) had the highest frequency (p-value < 0.001) of hard ticks’ infestation, followed by spring (23.34%), winter (21.35%), and autumn (17.29%). Ticks were widely distributed in four body zones on cattle, with the highest distribution on zone 5 (95.43%) (p-value < 0.001), which includes the sternum, abdomen, udder, scrotum, and inner sides of the hind legs, and the lowest distribution on zone 1 (0.06%), which includes the legs and hooves. The research indicates that economically significant ticks are prevalent in all studied municipalities, indicating a warning sign.

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Section: Predilection Sitessupporting

confidence: 53%

Morphological identification, seasonal prevalence, and predilection sites of hard tick species infesting cattle in four municipalities of the province of Tiaret, northwest Algeria

Achour,

Kouidri,

Selles

et al. 2024

Preprint

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“…This above-mentioned hypothesis is supported by the fact that we have previously reported high tick infestation rates in the cattle compared to small ruminants and a predominance of Hyalomma spp. ticks in cattle than small ruminants ( Sado Yousseu et al., 2022 ). Unfortunately, juvenile cattle were not included in the study since sampling was done in markets.…”

Section: Discussionmentioning

confidence: 99%

“…To support morphological identification, the tick species was confirmed by molecular analysis of the Cytochrome c Oxidase subunit 1 (Cox1) and 16S rDNA (Lv. et al, 2014;Sado Yousseu et al, 2022).…”

Section: Sample Collection and Processingmentioning

confidence: 98%

Molecular and serological evidence of Crimean-Congo hemorrhagic fever orthonairovirus prevalence in livestock and ticks in Cameroon

Tchetgna

Yousseu

Cosset

et al. 2023

Front. Cell. Infect. Microbiol.

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IntroductionDespite a high fatality rate in humans, little is known about the occurrence of Crimean-Congo hemorrhagic fever virus (CCHFV) in Cameroon. Hence, this pioneer study was started with the aim of determining the prevalence of CCHFV in domestic ruminants and its potential vector ticks in Cameroon.MethodsA cross-sectional study was carried out in two livestock markets of Yaoundé to collect blood and ticks from cattle, sheep, and goats. CCHFV-specific antibodies were detected in the plasma using a commercial ELISA assay and confirmed using a modified seroneutralization test. Ticks were screened for the presence of orthonairoviruses by amplification of a fragment of the L segment using RT-PCR. Phylogeny was used to infer the genetic evolution of the virus.ResultsOverall, 756 plasma samples were collected from 441 cattle, 168 goats, and 147 sheep. The seroprevalence of CCHFV was 61.77% for all animals, with the highest rate found in cattle (433/441, 98.18%) followed by sheep (23/147, 15.65%), and goats (11/168, 6.55%), (p-value < 0.0001). The highest seroprevalence rate was found in cattle from the Far North region (100%). Overall, 1500 ticks of the Rhipicephalus (773/1500, 51.53%), Amblyomma (341/1500, 22.73%), and Hyalomma (386/1500, 25.73%) genera were screened. CCHFV was identified in one Hyalomma truncatum pool collected from cattle. Phylogenetic analysis of the L segment classified this CCHFV strain within the African genotype III.ConclusionThese seroprevalence results call for additional epidemiological studies on CCHFV, especially among at-risk human and animal populations in high-risk areas of the country.

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“…R. microplus is reported to have originated in India and disseminated to other parts of the world through animal trading. Studies on the genetic diversity in R. microplus strains across countries have been conducted by various researchers using mitochondrial and ribosomal genes (16S rRNA, 12S rRNA, COX1, microsatellites, and internal transcribed spacer) [ 17 , 18 , 22 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. The results of these studies exhibited different clades and the existence of crypto species of R. microplus in different parts of the globe [ 17 , 18 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

Genetic Diversity of Rhipicephalus (Boophilus) microplus for a Global Scenario: A Comprehensive Review

Sankar,

Kumar,

Manjunathachar

et al. 2024

Pathogens

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Rhipicephalus microplus poses a substantial threat to livestock health and agricultural economies worldwide. Its remarkable adaptability to diverse environments and hosts is a testament to its extensive genetic diversity. This review delves into the genetic diversity of R. microplus, employing three pivotal genetic markers: the cytochrome c oxidase I (COX1) gene, ribosomal genes, and microsatellites. The COX1 gene, a crucial tool for genetic characterization and phylogenetic clustering, provides insights into the adaptability of ticks. Ribosomal genes, such as internal transcribed spacer regions (ITS-1 and2) as well as 18S and 28S, are routinely utilized for species differentiation. However, their use is limited due to indels (insertions and deletions). Microsatellites and minisatellites, known for their high polymorphism, have been successfully employed to study populations and genetic diversity across various tick species. Despite their effectiveness, challenges such as null alleles and marker variations warrant careful consideration. Bm86, a well-studied vaccine candidate, exhibits substantial genetic diversity. This diversity directly influences vaccine efficacy, posing challenges for developing a universally effective Bm86-based vaccine. Moreover, the review emphasizes the prevalence of genes associated with synthetic pyrethroid resistance. Identifying single nucleotide polymorphisms in the acaricide-resistant genes of R. microplus has facilitated the development of molecular markers for detecting and monitoring resistance against synthetic pyrethroids. However, mutations in sodium channels, the target site for synthetic pyrethroid, correlate well with the resistance status of R. microplus, which is not the case with other acaricide target genes. This study underscores the importance of understanding genetic diversity in developing effective tick management strategies. The choice of genetic marker should be tailored based on the level of taxonomic resolution and the group of ticks under investigation. A holistic approach combining multiple markers and integrating additional molecular and morphological data may offer a more comprehensive understanding of tick diversity and relationships. This research has far-reaching implications in formulating breeding programs and the development of vaccine against ticks and tick-borne diseases (TTBDs) as well as strategies for the management of resistant ticks.

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Infestation rates, seasonal distribution, and genetic diversity of ixodid ticks from livestock of various origins in two markets of Yaoundé, Cameroon

Cited by 7 publications

References 44 publications

Morphological identification, seasonal prevalence, and predilection sites of hard tick species infesting cattle in four municipalities of the province of Tiaret, northwest Algeria

Morphological identification, seasonal prevalence, and predilection sites of hard tick species infesting cattle in four municipalities of the province of Tiaret, northwest Algeria

Molecular and serological evidence of Crimean-Congo hemorrhagic fever orthonairovirus prevalence in livestock and ticks in Cameroon

Genetic Diversity of Rhipicephalus (Boophilus) microplus for a Global Scenario: A Comprehensive Review

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