scholarly journals Rhipicephalus Tick: A Contextual Review for Southeast Asia

Pathogens ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 821
Author(s):  
Li Peng Tan ◽  
Ruhil Hayati Hamdan ◽  
Basripuzi Nurul Hayyan Hassan ◽  
Mohd Farhan Hanif Reduan ◽  
Ibrahim Abdul-Azeez Okene ◽  
...  
Keyword(s):  
Southeast Asia ◽  
Host Species ◽  
Control Strategies ◽  
Morphological Characteristics ◽  
Human Populations ◽  
Acaricide Resistance ◽  
Babesia Species ◽  
Specific Interest ◽  
General Control ◽  
Potential Risks

Rhipicephalus species are distributed globally with a notifiable presence in Southeast Asia (SEA) within animal and human populations. The Rhipicephalus species are highly adaptive and have established successful coexistence within human dwellings and are known to be active all year round, predominantly in tropical and subtropical climates existing in SEA. In this review, the morphological characteristics, epidemiology, and epizootiology of Rhipicephalus tick species found in SEA are reviewed. There are six commonly reported Rhipicephalus ticks in the SEA region. Their interactions with their host species that range from cattle, sheep, and goats, through cats and dogs, to rodents and man are discussed in this article. Rhipicephalus-borne pathogens, including Anaplasma species, Ehrlichia species, Babesia species, and Theileria species, have been highlighted as are relevant to the region in review. Pathogens transmitted from Rhipicepahalus ticks to host animals are usually presented clinically with signs of anemia, jaundice, and other signs of hemolytic changes. Rhipicephalus ticks infestation also account for ectoparasitic nuisance in man and animals. These issues are discussed with specific interest to the SEA countries highlighting peculiarities of the region in the epidemiology of Rhipicephalus species and attendant pathogens therein. This paper also discusses the current general control strategies for ticks in SEA proffering measures required for increased documentation. The potential risks associated with rampant and improper acaricide use are highlighted. Furthermore, such practices lead to acaricide resistance among Rhipicephalus species are highlighted.

scholarly journals A Systematic Study on DNA Barcoding of Medicinally Important Genus Epimedium L. (Berberidaceae)

Genes ◽  
2018 ◽  
Vol 9 (12) ◽  
pp. 637 ◽  
Author(s):  
Mengyue Guo ◽  
Yanqin Xu ◽  
Li Ren ◽  
Shunzhi He ◽  
and Xiaohui Pang
Keyword(s):  
Dna Barcode ◽  
Morphological Characteristics ◽  
Identification Accuracy ◽  
Dna Barcodes ◽  
Success Rates ◽  
Data Set ◽  
Herba Epimedii ◽  
Potential Risks ◽  
Medicinal Properties ◽  
Species Being

Genus Epimedium consists of approximately 50 species in China, and more than half of them possess medicinal properties. The high similarity of species’ morphological characteristics complicates the identification accuracy, leading to potential risks in herbal efficacy and medical safety. In this study, we tested the applicability of four single loci, namely, rbcL, psbA-trnH, internal transcribed spacer (ITS), and ITS2, and their combinations as DNA barcodes to identify 37 Epimedium species on the basis of the analyses, including the success rates of PCR amplifications and sequencing, specific genetic divergence, distance-based method, and character-based method. Among them, character-based method showed the best applicability for identifying Epimedium species. As for the DNA barcodes, psbA-trnH showed the best performance among the four single loci with nine species being correctly differentiated. Moreover, psbA-trnH + ITS and psbA-trnH + ITS + rbcL exhibited the highest identification ability among all the multilocus combinations, and 17 species, of which 12 are medicinally used, could be efficiently discriminated. The DNA barcode data set developed in our study contributes valuable information to Chinese resources of Epimedium. It provides a new means for discrimination of the species within this medicinally important genus, thus guaranteeing correct and safe usage of Herba Epimedii.

A checklist of chigger mites (Acariformes: Trombiculidae) of Southeast Asia

Zootaxa ◽  
2021 ◽  
Vol 4913 (1) ◽  
pp. 1-163
Author(s):  
ALEXANDR A. STEKOLNIKOV
Keyword(s):  
Southeast Asia ◽  
Host Species ◽  
Reference Data ◽  
The Philippines ◽  
Valid Species ◽  
New Combinations ◽  
New Synonyms ◽  
Collection Data

Chigger mites (Acariformes: Trombiculidae) of Southeast Asia, including Myanmar, Malaysia, Brunei, Singapore, Indonesia, Thailand, Cambodia, Vietnam, and the Philippines have been revised based on reference data and examination of type materials in European collections of chiggers. For 450 species of 49 genera synonymy, collection data on types, lists of known host species and lists of countries are given. The lists of hosts include in total 649 valid species and subspecies of mammals, birds, reptiles, amphibians, and arthropods. Two new synonyms were established: Doloisia (Doloisia) Oudemans, 1910 (= Doloisia (Trisetoisia) Vercammen-Grandjean, 1968, syn. nov.) and Gahrliepia lui Chen and Hsu, 1955 (= Gahrliepia (Gateria) octosetosa Chen, Hsu and Wang, 1956, syn. nov.). Twenty-seven new combinations were proposed: Walchia (Ripiaspichia) biliranensis (Brown, 1997), comb. nov., Walchia (Ripiaspichia) huberti (Upham and Nadchatram, 1968), comb. nov., Walchia (Ripiaspichia) parmulaseta (Brown, 1997), comb. nov., and Walchia (Ripiaspichia) serrata (Brown and Goff, 1988), comb. nov., transferred from Gahrliepia Oudemans, 1912; Farrellioides consuetum (Womersley, 1952), comb. nov. (originally in Trombicula Berlese, 1905), Farrellioides nakatae (Nadchatram and Traub, 1964), comb. nov. (originally in Leptotrombidium Nagayo, Miyagawa, Mitamura and Imamura, 1916), and Farrellioides striatum (Nadchatram and Traub, 1964), comb. nov. (originally in Leptotrombidium), transferred from Euschoengastia Ewing, 1938; Guntheria (Phyllacarus) bushlandi (Philip, 1947), comb. nov. (originally in Ascoschoengastia Ewing, 1946), transferred from Guntherana Womersley and Heaslip, 1943 (syn. of Guntheria Womersley, 1939); Kayella masta (Traub and Sundermeyer, 1950), comb. nov. (originally in Ascoschoengastia), transferred from Cordiseta Hoffmann, 1954; Neoschoengastia stekolnikovi (Kalúz, 2016), comb. nov., transferred from Hypogastia Vercammen-Grandjean, 1967; Susa chiropteraphilus (Brown, 1997), comb. nov., Susa masawanensis (Brown, 1998), comb. nov., and Susa palawanensis (Brown and Goff, 1988), comb. nov., transferred from Cheladonta Lipovsky, Crossley and Loomis, 1955; Ericotrombidium cosmetopode (Vercammen-Grandjean and Langston, 1971), comb. nov., transferred from Leptotrombidium; Eutrombicula gigarara (Brown, 1997), comb. nov., transferred from Siseca Audy, 1956; Microtrombicula eltoni (Audy, 1956), comb. nov., transferred from Eltonella Audy, 1956; Trombiculindus alethrix (Traub and Nadchatram, 1967), comb. nov., Trombiculindus cuteanum (Vercammen-Grandjean and Langston, 1976), comb. nov., Trombiculindus frondosum (Traub and Nadchatram, 1967), comb. nov., Trombiculindus hastatum (Gater, 1932), comb. nov., Trombiculindus lepismatum (Traub and Nadchatram, 1967), comb. nov., Trombiculindus limi (Traub and Nadchatram, 1967), comb. nov., Trombiculindus maxwelli (Traub and Nadchatram, 1967), comb. nov., Trombiculindus roseannleilaniae (Brown, 1992), comb. nov., Trombiculindus sarisatum (Traub and Nadchatram, 1967), comb. nov., Trombiculindus vanpeeneni (Hadi and Carney, 1977), comb. nov., and Trombiculindus yooni (Traub and Nadchatram, 1967), comb. nov., transferred from Leptotrombidium. 

scholarly journals Intracellular Interactions Between Arboviruses and Wolbachia in Aedes aegypti

2021 ◽  
Vol 11 ◽  
Author(s):  
Jerica Isabel L. Reyes ◽  
Yasutsugu Suzuki ◽  
Thaddeus Carvajal ◽  
Maria Nilda M. Muñoz ◽  
Kozo Watanabe
Keyword(s):  
Aedes Aegypti ◽  
Vector Control ◽  
Host Species ◽  
Control Strategies ◽  
Cytoskeletal Proteins ◽  
Cellular Interactions ◽  
Cellular Mechanisms ◽  
Cellular Regeneration ◽  
Release Program ◽  
Human Infections

Aedes aegypti is inherently susceptible to arboviruses. The geographical expansion of this vector host species has led to the persistence of Dengue, Zika, and Chikungunya human infections. These viruses take advantage of the mosquito’s cell to create an environment conducive for their growth. Arboviral infection triggers transcriptomic and protein dysregulation in Ae. aegypti and in effect, host antiviral mechanisms are compromised. Currently, there are no existing vaccines able to protect human hosts from these infections and thus, vector control strategies such as Wolbachia mass release program is regarded as a viable option. Considerable evidence demonstrates how the presence of Wolbachia interferes with arboviruses by decreasing host cytoskeletal proteins and lipids essential for arboviral infection. Also, Wolbachia strengthens host immunity, cellular regeneration and causes the expression of microRNAs which could potentially be involved in virus inhibition. However, variation in the magnitude of Wolbachia’s pathogen blocking effect that is not due to the endosymbiont’s density has been recently reported. Furthermore, the cellular mechanisms involved in this phenotype differs depending on Wolbachia strain and host species. This prompts the need to explore the cellular interactions between Ae. aegypti-arboviruses-Wolbachia and how different Wolbachia strains overall affect the mosquito’s cell. Understanding what happens at the cellular and molecular level will provide evidence on the sustainability of Wolbachia vector control.

scholarly journals Identification and Cluster Analysis of Pitcher Plant (Nepenthes spp.) from South Sumatera Indonesia

2018 ◽  
Vol 10 (2) ◽  
pp. 245-251
Author(s):  
Weni Lestari ◽  
Jumari Jumari ◽  
Rejeki Siti Ferniah
Keyword(s):  
Cluster Analysis ◽  
Southeast Asia ◽  
Morphological Characteristics ◽  
Morphological Characters ◽  
Morphological Data ◽  
Pitcher Plant ◽  
And Cluster Analysis

Nepenthes spp. is a typical plant of Southeast Asia especially Indonesia which has a special leaf modification called a pitcher. The largest number of Nepenthes spp. species in Indonesia is on the island of Sumatra. The purpose of this reseach was to identify and analyze cluster Nepenthes spp. from South Sumatra based on morphological characteristics. The specimens were collected from the forest of Tekorejo Village, Air Itam Village and cultivation location in Palembang city of South Sumatra. Identification of morphological characters performed on the characteristics of root, stem, leaves, and pitcher. The morphological data is used for cluster analysis using NTSYS software version 2.02. The identification results showed 9 variants of Nepenthes spp. which belong to the species N. mirabilis, N. gracilis, and N. sumatrana. Dendogram analysis results form two main clusters with a similarity value of 22%. The first cluster consists of N. mirabilis and N. sumatrana. The second cluster consists of N. gracilis. Based on the results of this study can be concluded that the species Nepenthes spp. South Sumatra is N. mirabilis, N. gracilis, and N. sumatrana. The results of this study will be dedicated to updating information about the existence of Nepenthes spp. from South Sumatra and his cluster.

scholarly journals Analysis and simulations with a multi-scale model of canine visceral leishmaniasis

2020 ◽  
Vol 15 ◽  
pp. 72
Author(s):  
Jonathan Shane Welker ◽  
Maia Martcheva
Keyword(s):  
Visceral Leishmaniasis ◽  
Control Strategies ◽  
Sufficient Conditions ◽  
Parasite Load ◽  
Backward Bifurcation ◽  
Control Measures ◽  
Scale Model ◽  
Human Populations ◽  
Well Posedness ◽  
Biting Rate

Visceral leishmaniasis in dogs is believed to have an impact on the prevalence of the disease in human populations. Here, we continue the analysis of the nested immuno-epidemiological model of visceral leishmaniasis in dogs, including a proof of well-posedness using functional analytical methods. Once well-posedness is established, we continue stability analysis of the endemic equilibria and provide necessary and sufficient conditions for the presence of backward bifurcation, and prove the instability of the lower endemic equilibrium in the presence of backward bifurcation. Lastly, we provide a number of simulations of the model using a number of control strategies. Control measures currently in use attempt to reduce the parasite load in the host, reduce the vector population, reduce the vector biting rate, and remove infected hosts. We examine various combinations of these strategies and conclude that a strategy combining culling infected dogs and removing vectors from the population by means such as insecticide will be the most effective.

scholarly journals A strategy to assess spillover risk of bat SARS-related coronaviruses in Southeast Asia

2021 ◽  
Author(s):  
Cecilia A. Sánchez ◽  
Hongying Li ◽  
Kendra L. Phelps ◽  
Carlos Zambrana-Torrelio ◽  
Lin-Fa Wang ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Global Health ◽  
Southeast Asia ◽  
Prevention Programs ◽  
Emerging Diseases ◽  
Human Populations ◽  
Evolutionary Adaptation ◽  
South And Southeast Asia ◽  
Target Prevention ◽  
Novel Virus

AbstractEmerging diseases caused by coronaviruses of likely bat origin (e.g. SARS, MERS, SADS and COVID-19) have disrupted global health and economies for two decades.Evidence suggests that some bat SARS-related coronaviruses (SARSr-CoVs) could infect people directly, and that their spillover is more frequent than previously recognized. Each zoonotic spillover of a novel virus represents an opportunity for evolutionary adaptation and further spread; therefore, quantifying the extent of this “hidden” spillover may help target prevention programs. We derive biologically realistic range distributions for known bat SARSr-CoV hosts and quantify their overlap with human populations. We then use probabilistic risk assessment and data on human-bat contact, human SARSr-CoV seroprevalence, and antibody duration to estimate that ∼400,000 people (median: ∼50,000) are infected with SARSr-CoVs annually in South and Southeast Asia. These data on the geography and scale of spillover can be used to target surveillance and prevention programs for potential future bat-CoV emergence.

scholarly journals Trait-Based Vaccination of Individual Meerkats (Suricata suricatta) against Tuberculosis Provides Evidence to Support Targeted Disease Control

Animals ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 192
Author(s):  
Stuart J. Patterson ◽  
Tim H. Clutton-Brock ◽  
Dirk U. Pfeiffer ◽  
Julian A. Drewe
Keyword(s):  
Disease Control ◽  
Control Strategies ◽  
Vaccination Strategy ◽  
Human Populations ◽  
Infection Rates ◽  
Survival Times ◽  
Control Groups ◽  
Free Living ◽  
Suricata Suricatta ◽  
The One

Individuals vary in their potential to acquire and transmit infections, but this fact is currently underexploited in disease control strategies. We trialled a trait-based vaccination strategy to reduce tuberculosis in free-living meerkats by targeting high-contact meerkats (socially dominant individuals) in one study arm, and high-susceptibility individuals (young subordinates) in a second arm. We monitored infection within vaccinated groups over two years comparing the results with untreated control groups. Being a member of a high-contact group had a protective effect on individuals’ survival times (Hazard Ratio = 0.5, 95% Confidence Interval, CI: 0.29–0.88, p = 0.02) compared to control groups. Over the study, odds of testing positive for tuberculosis increased more than five-fold in control groups (Odds Ratio = 5.40, 95% CI = 0.94–30.98, p = 0.058); however, no increases were observed in either of the treatment arms. Targeted disease control approaches, such as the one described in this study, allow for reduced numbers of interventions. Here, trait-based vaccination was associated with reduced infection rates and thus has the potential to offer more efficient alternatives to traditional mass-vaccination policies. Such improvements in efficiency warrant further study and could make infectious disease control more practically achievable in both animal (particularly wildlife) and human populations.

scholarly journals Evaluasi Sistem Informasi Aktiva Tetap pada PT TMS

2013 ◽  
Vol 4 (2) ◽  
pp. 961
Author(s):  
Imelda Suardi ◽  
Henny Hendarti
Keyword(s):  
Information System ◽  
Control Design ◽  
Field Research ◽  
Literature Study ◽  
General Control ◽  
Fixed Assets ◽  
Potential Risks ◽  
And Control

The purpose of this study is to evaluate and assess how well the information system of fixed assets implemented by PT TMS (including general control and application control) in minimizing the current risks through the implemented controls. The methodology used is literature study by collecting data from a variety of books related to the topic and field research, such as observation, interviews, and questionnaires. Results of the evaluation are risks that exist in the system presented in the form of matrix of risk and control which consist of problem findings, potential risks (impact and likelihood) and the reliability of existing control (design and effectiveness). The general control applied by the company is found quite well, but the application control still needs improvement.

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